Denis Diderot

Denis Diderot (5 October 1713 – 31 July 1784) was a French philosopher and chief editor of the historic project to produce L'Encyclopédie.

Quotes

From fanaticism to barbarism is only one step.
- Essai sur le Mérite de la Vertu (1745); a translation and adaptation of Inquiry concerning Virtue or Merit (1699) by Anthony Ashley-Cooper, 3rd Earl of Shaftesbury

If you want me to believe in God, you must make me touch him.
- Portraying a fictional conversation of Nicholas Saunderson with a priest, in ' Lettre sur les aveugles [Letter about the Blind] (1749), as quoted in Diderot and the Encyclopædists (1897) by John Morley, p. 92. Publication of this work resulted in Diderot being arrested and imprisoned.

What is this world? A complex whole, subject to endless revolutions. All these revolutions show a continual tendency to destruction; a swift succession of beings who follow one another, press forward, and vanish; a fleeting symmetry; the order of a moment. I reproached you just now with estimating the perfection of things by your own capacity; and I might accuse you here of measuring its duration by the length of your own days. You judge of the continuous existence of the world, as an ephemeral insect might judge of yours. The world is eternal for you, as you are eternal to the being that lives but for one instant. Yet the insect is the more reasonable of the two. For what a prodigious succession of ephemeral generations attests your eternity! What an immeasurable tradition! Yet shall we all pass away, without the possibility of assigning either the real extension that we filled in space, or the precise time that we shall have endured. Time, matter, space — all, it may be, are no more than a point.
- Dying words of Nicholas Saunderson as portrayed in Lettre sur les aveugles [Letter on the Blind] (1749)
- Variant translation:
- What is this world of ours? A complex entity subject to sudden changes which all indicate a tendency to destruction; a swift succession of beings which follow one another, assert themselves and disappear; a fleeting symmetry; a momentary order.

As to all the outward signs that awaken within us feelings of sympathy and compassion, the blind are only affected by crying; I suspect them in general of lacking humanity. What difference is there for a blind man, between a man who is urinating, and man who, without crying out, is bleeding? And we ourselves, do we not cease to commiserate, when the distance or the smallness of the objects in question produce the same effect on us as the lack of sight produces in the blind man? All our virtues depend on the faculty of the senses, and on the degree to which external things affect us. Thus I do not doubt that, except for the fear of punishment, many people would not feel any remorse for killing a man from a distance at which he appeared no larger than a swallow. No more, at any rate, than they would for slaughtering a cow up close. If we feel compassion for a horse that suffers, but if we squash an ant without any scruple, isn’t the same principle at work?
- Lettre sur les aveugles [Letter on the Blind] (1749)

When one compares the talents one has with those of a Leibniz, one is tempted to throw away one's books and go die quietly in the dark of some forgotten corner.
- Oeuvres complètes, vol. 7, p. 678

Only a very bad theologian would confuse the certainty that follows revelation with the truths that are revealed. They are entirely different things.
- Apology for the Abbé de Prades (1752)

Il y a un peu de testicule au fond de nos sentiments les plus sublimes et de notre tendresse la plus épurée.
- There's a bit of testicle at the bottom of our most sublime feelings and our purest tenderness.
- Letter to Étienne Noël Damilaville (1760-11-03)

There is no kind of harassment that a man may not inflict on a woman with impunity in civilized societies.
- "On Women" (1772), as translated in Selected Writings (1966) edited by Lester G. Crocker

Impenetrable in their dissimulation, cruel in their vengeance, tenacious in their purposes, unscrupulous as to their methods, animated by profound and hidden hatred for the tyranny of man — it is as though there exists among them an ever-present conspiracy toward domination, a sort of alliance like that subsisting among the priests of every country.
- "On Women" (1772), as translated in Selected Writings (1966) edited by Lester G. Crocker

The arbitrary rule of a just and enlightened prince is always bad. His virtues are the most dangerous and the surest form of seduction: they lull a people imperceptibly into the habit of loving, respecting, and serving his successor, whoever that successor may be, no matter how wicked or stupid.
- "Refutation of Helvétius" (written 1773-76, published 1875)

L'esprit de l'escalier
- "Spirit of the staircase" or "Staircase inspiration"
  - This phrase is a famous allusion to the witty remarks one thinks of when it is too late, as when one is leaving a meeting and going down the stairs. Paradoxe sur le Comédien (1773-1777)

It has been said that love robs those who have it of their wit, and gives it to those who have none.
- Paradoxe sur le Comédien (1773-1777)

Man was born to live with his fellow human beings. Separate him, isolate him, his character will go bad, a thousand ridiculous affects will invade his heart, extravagant thoughts will germinate in his brain, like thorns in an uncultivated land.
- The character Suzanne Simon, in La Religieuse [The Nun] (1796)

As for our celebrated lawgivers, who have cast us in our present awkward mold, you may be sure that they have acted to serve their interests and not ours. Witness all our political, civil, and religious institutions — examine them thoroughly: unless I am very much mistaken, you will see how, through the ages, the human race has been broken to the halter that a handful of rascals were itching to impose. Watch out for the fellow who talks about putting things in order! Putting things in order always means getting other people under your control.
- "Supplement to Bougainville's Voyage" (1796)
- Variant translation:
- Never allow yourselves to forget that it is for their own sakes and not for yours that all those wise lawgivers have forced you into your present unnatural and rigid molds. And as evidence of this, I need only produce all our political, civil, and religious institutions. Examine them thoroughly, and either I am very much mistaken or you will find that mankind has been forced to bow, century after century, beneath a mere handful of scoundrels has conspired, in ever age, to impose upon it. Beware of the man who wants to set things in order. Setting things in order always involves acquiring mastery over others — by tying them hand and foot.
  - As translated by Derek Coleman, in Diderot's Selected Writings (1966)

The wisest among us is very lucky never to have met the woman, be she beautiful or ugly, intelligent or stupid, who could drive him crazy enough to be fit to be put into an asylum.
- Ceci n’est pas un conte [This Is No Tale] (1796),

How old the world is! I walk between two eternities...

How old the world is! I walk between two eternities... What is my fleeting existence in comparison with that decaying rock, that valley digging its channel ever deeper, that forest that is tottering and those great masses above my head about to fall? I see the marble of tombs crumbling into dust; and yet I don’t want to die!
- Salon of 1767 (1798), Oeuvres esthétiques

I have often seen an actor laugh off the stage, but I don’t remember ever having seen one weep.
- "Paradox on Acting" (1830), as quoted in Selected Writings (1966) edited by Lester G. Crocker

Justice is the first virtue of those who command, and stops the complaints of those who obey.
- As quoted in The Golden Treasury of Thought : A Gathering of Quotations from the Best Ancient and Modern Authors (1873) by Theodore Taylor, p. 227

Et ses mains ourdiraient les entrailles du prêtre,
Au défaut d’un cordon pour étrangler les rois.
- And his hands would plait the priest's entrails,
  For want of a rope, to strangle kings.
- "Les Éleuthéromanes", in Poésies Diverses (1875)
- Variant translation: His hands would plait the priest's guts, if he had no rope, to strangle kings.
  - This derives from the prior statement widely attributed to Jean Meslier: "I would like — and this would be the last and most ardent of my wishes — I would like the last of the kings to be strangled by the guts of the last priest". It is often claimed the passage appears in Meslier's Testament (1725), but it appears only in abstracts of the work written by others. See the Wikipedia article Jean Meslier for details.
- Variant: Et des boyaux du dernier prêtre
  Serrons le cou du dernier roi.
  - Let us strangle the last king with the guts of the last priest.
    - Attributed to Diderot by Jean-François de La Harpe in Cours de Littérature Ancienne et Moderne (1840)
- Attributions to Diderot of similar statements also occur in various forms, i.e.: "Men will never be free until the last king is strangled with the entrails of the last priest."

The more man ascends through the past, and the more he launches into the future, the greater he will be, and all these philosophers and ministers and truth-telling men who have fallen victims to the stupidity of nations, the atrocities of priests, the fury of tyrants, what consolation was left for them in death? This: That prejudice would pass, and that posterity would pour out the vial of ignominy upon their enemies. O Posterity! Holy and sacred stay of the unhappy and the oppressed; thou who art just, thou who art incorruptible, thou who findest the good man, who unmaskest the hypocrite, who breakest down the tyrant, may thy sure faith, thy consoling faith never, never abandon me!
- As quoted in "Diderot" in The Great Infidels (1881) by Robert Green Ingersoll; The Works of Robert G. Ingersoll Vol. III (1900), p. 367

Pithy sentences are like sharp nails which force truth upon our memory.
- As quoted in A Dictionary of Thoughts : Being a Cyclopedia of Laconic Quotations (1908) by Tryon Edwards, p. 338

The best doctor is the one you run for and can't find.
- As quoted in Selected Thoughts from the French: XV Century - XX Century, with English Translations (1913) by James Raymond Solly, p. 67

[Africans are] always vicious... mostly inclined to lasciviousness, vengeance, theft and lies.
- As quoted in David Johnson, 'Representing the Cape "Hottentots", from the French Enlightenment to Post-Apartheid South Africa', Eighteenth-Century Studies, 40.4 (Summer 2007), 525-52. https://www.jstor.org/stable/30053727.

Distance is a great promoter of admiration!
- As quoted in Thesaurus of Epigrams: A New Classified Collection of Witty Remarks, Bon Mots and Toasts (1942) by Edmund Fuller

We are far more liable to catch the vices than the virtues of our associates.
- As quoted in Thesaurus of Epigrams: A New Classified Collection of Witty Remarks, Bon Mots and Toasts (1942) by Edmund Fuller

Evil always turns up in this world through some genius or other.
- As quoted in Dictionary of Foreign Quotations (1980) by Mary Collison, Robert L. Collison, p. 98

There is no moral precept that does not have something inconvenient about it.
- As quoted in Dictionary of Foreign Quotations (1980) by Mary Collison, Robert L. Collison, p. 235

I am beginning to feel that I am growing old; soon, I shall have to eat mush like children. I shall no longer be able to speak, which will be a rather great advantage for others and but a small inconvenience for myself.... The time in which I count in years is gone; that in which I count in days is here.... I had thought that the fibers of the heart would grow callous with age, it's not at all the case. I am not sure that my sensitivity hasn't increased; everything moves me, affects me.... To fade out between a man feeling your pulse and another bothering your head; not to know where one comes from, why one came, where one is going ...
- Letter to his sister Denise, as quoted in Diderot, Reason and Resonance (1982) by Élisabeth de Fontenay, pp. 270–271

I believe in God, although I live very happily with atheists... It is very important not to mistake hemlock for parsley; but not at all so to believe or not in God.
- As quoted in Against the Faith (1985) by Jim Herrick, p. 75
- Variant translation: It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all.

There are things I can't force. I must adjust. There are times when the greatest change needed is a change of my viewpoint.
- As quoted in Cracking the Code of Our Physical Universe : The Key to a Whole New World of Enlightenment and Enrichment (2006) by Matthew M Radmanesh, p. 91

Happiest are the people who give most happiness to others.
- As quoted in Happyology by Harald W. Tietze, p. 28

[Jews are] angry and brutish people, vile and vulgar men, slaves worthy of the yoke [Talmudism] which you bear... Go, take back your books and remove yourselves from me. [ The Talmud ] taught the Jews to steal the goods of Christians, to regard them as savage beasts, to push them over the precipice... to kill them with impunity and to utter every morning the most horrible imprecations against them.
- See The Jews: A History, Second Edition, by John Efron, Steven Weitzman and Matthias Lehmann

Pensées Philosophiques (1746)

Philosophical Thoughts (1746)

When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music.
- Ch. 3, as quoted in Selected Writings (1966) edited by Lester G. Crocker

To attempt the destruction of our passions is the height of folly. What a noble aim is that of the zealot who tortures himself like a madman in order to desire nothing, love nothing, feel nothing, and who, if he succeeded, would end up a complete monster!
- Ch. 5, as quoted in Selected Writings (1966) edited by Lester G. Crocker

The God of the Christians is a father who makes much of his apples, and very little of his children.
- No. 16

On doit exiger de moi que je cherche la vérité, mais non que je la trouve.
- One may demand of me that I should seek truth, but not that I should find it.
  - No. 29; Variant translation: I can be expected to look for truth but not to find it.

There is no good father who would want to resemble our Heavenly Father
- No. 51

We are constantly railing against the passions; we ascribe to them all of man’s afflictions, and we forget that they are also the source of all his pleasures … But what provokes me is that only their adverse side is considered … and yet only passions, and great passions, can raise the soul to great things. Without them there is no sublimity, either in morals or in creativity. Art returns to infancy, and virtue becomes small-minded.
- As translated in Diderot (1977) by Otis Fellows, p. 39
- Variant translations:
- One declaims endlessly against the passions; one imputes all of man's suffering to them. One forgets that they are also the source of all his pleasures.
- Only passions, great passions, can elevate the soul to great things.

Superstition is more injurious to God than atheism.

Scepticism is the first step towards truth.
- Variant: A thing is not proved just because no one has ever questioned it. What has never been gone into impartially has never been properly gone into. Hence skepticism is the first step toward truth. It must be applied generally, because it is the touchstone.
  - As quoted in The Anchor Book of French Quotations with English Translations (1963) by Norbert Gutermam
- Variant: The first step towards philosophy is incredulity.

To prove the Gospels by a miracle is to prove an absurdity by something contrary to nature.
- As quoted in The Anchor Book of French Quotations with English Translations (1963) by Norbert Gutermam

To say that man is a compound of strength and weakness, light and darkness, smallness and greatness, is not to indict him, it is to define him.
- As quoted in The Anchor Book of French Quotations with English Translations (1963) by Norbert Gutermam

We do not know nature; causes hidden in her breast might have produced everything. In your turn, observe the polyp of Trembley: does it not contain in itself the causes which bring about regeneration? Why then would it be absurd to think that there are physical causes by reason of which everything has been made, and to which the whole chain of this vast universe is so necessarily bound and held that, nothing which happens, could have failed to happen,—causes, of which we are so invincibly ignorant that we have had recourse to a God, who, as some aver, is not so much as a logical entity? Thus to destroy chance is not to prove the existence of a supreme being, since there may be some other thing which is neither chance nor God—I mean, nature. It follows that the study of nature can make only unbelievers; and the way of thinking of all its more successful investigators proves this.
- As quoted by Julien Offray de La Mettrie, Man a Machine (1747) Tr. Gertrude Carman Bussey (1912)

L'Encyclopédie (1751-1766)

First published 1751-1766, revised in 1772, 1777 and 1780

This is a work that cannot be completed except by a society of men of letters and skilled workmen, each working separately on his own part, but all bound together solely by their zeal for the best interests of the human race and a feeling of mutual good will.
- Article on Encyclopedia, as translated in The Many Faces of Philosophy : Reflections from Plato to Arendt (2001), "Diderot", p. 237

Aucun homme n'a recu de la nature le droit de commander aux autres. La liberté est un présent du ciel, et chaque individu de la meme espèce a le droit d'en jouir aussitòt qu'il jouit de la raison.
- No man has received from nature the right to give orders to others. Freedom is a gift from heaven, and every individual of the same species has the right to enjoy it as soon as he is in enjoyment of his reason.
  - Article on Political Authority, Vol. 1, (1751) as quoted in Selected Writings (1966) edited by Lester G. Crocker
  - Variant translation: No man has received from nature the right to command his fellow human beings.

La puissance qui s'acquiert par la violence n'est qu'une usurpation, et ne dure qu'autant que la force de celui qui commande l'emporte sur celle de ceux qui obéissent.
- Power acquired by violence is only a usurpation, and lasts only as long as the force of him who commands prevails over that of those who obey.
  - Article on Political Authority, Vol. 1 (1751)

The good of the people must be the great purpose of government. By the laws of nature and of reason, the governors are invested with power to that end. And the greatest good of the people is liberty. It is to the state what health is to the individual.
- Article on Government

The philosopher forms his principles on an infinity of particular observations. … He does not confuse truth with plausibility; he takes for truth what is true, for forgery what is false, for doubtful what is doubtful, and probable what is probable. … The philosophical spirit is thus a spirit of observation and accuracy.

Reason is to the philosopher what grace is to the Christian.
Grace causes the Christian to act, reason the philosopher. Other men are carried away by their passions, their actions not being preceded by reflection: these are the men who walk in darkness. On the other hand, the philosopher, even in his passions, acts only after reflection; he walks in the dark, but by a torch.
The philosopher forms his principles from an infinity of particular observations. Most people adopt principles without thinking of the observations that have produced them, they believe the maxims exist, so to speak, by themselves. But the philosopher takes maxims from their source; he examines their origin; he knows their proper value, and he makes use of them only in so far as they suit him.
Truth is not for the philosopher a mistress who corrupts his imagination and whom he believes to be found everywhere; he contents himself with being able to unravel it where he can perceive it. He does not confound it with probability; he takes for true what is true, for false what is false, for doubtful what is doubtful, and probable what is only probable. He does more, and here you have a great perfection of the philosopher: when he has no reason by which to judge, he knows how to live in suspension of judgment...
The philosophical spirit is, then, a spirit of observation and exactness, which relates everything to true principles...
- Article on Philosophy, Vol. 25, p. 667, as quoted in Main Currents of Western Thought : Readings in Western European Intellectual History from the Middle Ages to the Present (1978) by Franklin Le Van Baumer
- Variant translation: Reason is to the philosopher what grace is to the Christian. Grace moves the Christian to act, reason moves the philosopher. Other men walk in darkness; the philosopher, who has the same passions, acts only after reflection; he walks through the night, but it is preceded by a torch. The philosopher forms his principles on an infinity of particular observations. … He does not confuse truth with plausibility; he takes for truth what is true, for forgery what is false, for doubtful what is doubtful, and probable what is probable. … The philosophical spirit is thus a spirit of observation and accuracy.

Go further, and require each of them to make a contribution: you will see how many things are still missing, and you will be obliged to get the assistance of a large number of men who belong to different classes, priceless men, but to whom the gates of the academies are nonetheless closed because of their social station. All the members of these learned societies are more than is needed for a single object of human science; all the societies together are not sufficient for a science of man in general.
- Article on Encyclopedia

The purpose of an encyclopedia is to collect knowledge disseminated around the globe; to set forth its general system to the men with whom we live, and transmit it to those who will come after us, so that the work of preceding centuries will not become useless to the centuries to come; and so that our offspring, becoming better instructed, will at the same time become more virtuous and happy, and that we should not die without having rendered a service to the human race in the future years to come
- Encyclopédie (Diderot 1755 pp 365 - 48A)

If exclusive privileges were not granted, and if the financial system would not tend to concentrate wealth, there would be few great fortunes and no quick wealth. When the means of growing rich is divided between a greater number of citizens, wealth will also be more evenly distributed; extreme poverty and extreme wealth would be also rare.
- Article on Wealth

On the Interpretation of Nature (1753)

In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go.

As translated in Selected Writings (1966) edited by Lester G. Crocker

Are we not madder than those first inhabitants of the plain of Sennar? We know that the distance separating the earth from the sky is infinite, and yet we do not stop building our tower.
- No. 4

There are three principal means of acquiring knowledge available to us: observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination. Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common.
- No. 15

In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go.
- No. 50

The following general definition of an animal: a system of different organic molecules that have combined with one another, under the impulsion of a sensation similar to an obtuse and muffled sense of touch given to them by the creator of matter as a whole, until each one of them has found the most suitable position for it shape and comfort.
- No. 51

On Dramatic Poetry (1758)

"On Dramatic Poetry" (1758), as quoted in Selected Writings (1966) edited by Lester G. Crocker

The pit of a theatre is the one place where the tears of virtuous and wicked men alike are mingled.

Genius is present in every age, but the men carrying it within them remain benumbed unless extraordinary events occur to heat up and melt the mass so that it flows forth.

It is not human nature we should accuse but the despicable conventions that pervert it.

Poetry must have something in it that is barbaric, vast and wild.

When shall we see poets born? After a time of disasters and great misfortunes, when harrowed nations begin to breathe again. And then, shaken by the terror of such spectacles, imaginations will paint things entirely strange to those who have not witnessed them.

Shakespeare’s fault is not the greatest into which a poet may fall. It merely indicates a deficiency of taste.

Rameau's Nephew (1762)

Le Neveu de Rameau (written 1762, published 1821)

Every man has his dignity. I'm willing to forget mine, but at my own discretion and not when someone else tells me to.

Every man has his dignity. I'm willing to forget mine, but at my own discretion and not when someone else tells me to.

If there is one realm in which it is essential to be sublime, it is in wickedness. You spit on a petty thief, but you can’t deny a kind of respect for the great criminal.

Bad company is as instructive as licentiousness. One makes up for the loss of one’s innocence with the loss of one’s prejudices.

People praise virtue, but they hate it, they run away from it. It freezes you to death, and in this world you've got to keep your feet warm.

Je m’entretiens avec moi-même de politique, d’amour, de goût ou de philosophie ; j’abandonne mon esprit à tout son libertinage ; je le laisse maître de suivre la première idée sage ou folle qui se présente … Mes pensées ce sont mes catins.
- I discuss with myself questions of politics, love, taste, or philosophy. I let my mind rove wantonly, give it free rein to follow any idea, wise or mad that may present itself. … My ideas are my harlots.
- Variant translations:
  - My ideas are my whores.
  - My thoughts are my trollops.

La reconnaissance est un fardeau, et tout fardeau est fait pour être secoué.
- Gratitude is a burden, and every burden is made to be shaken off.

We swallow greedily any lie that flatters us, but we sip only little by little at a truth we find bitter.

If your little savage were left to himself and be allowed to retain all his ignorance, he would in time join the infant’s reasoning to the grown man’s passion, he would strangle his father and sleep with his mother.

What a hell of an economic system! Some are replete with everything while others, whose stomachs are no less demanding, whose hunger is just as recurrent, have nothing to bite on. The worst of it is the constrained posture need puts you in. The needy man does not walk like the rest; he skips, slithers, twists, crawls.

D’Alembert’s Dream (1769)

D’Alembert’s Dream (written 1769, published 1830)

All abstract sciences are nothing but the study of relations between signs.
- Dr. Théophile de Bordeu, in “Conversation Between D’Alembert and Diderot”

We are all instruments endowed with feeling and memory. Our senses are so many strings that are struck by surrounding objects and that also frequently strike themselves.
- “Conversation Between D’Alembert and Diderot”

Do you see this egg? With this you can topple every theological theory, every church or temple in the world. What is it, this egg, before the seed is introduced into it? An insentient mass. And after the seed has been introduced to into it? What is it then? An insentient mass. For what is the seed itself other than a crude and inanimate fluid? How is this mass to make a transition to a different structure, to sentience, to life? Through heat. And what will produce that heat in it? Motion.
- “Conversation Between D’Alembert and Diderot”, as quoted in Selected Writings (1966) edited by Lester G. Crocker, and The Enlightenment and the Intellectual Foundations of Modern Culture (2004) by Louis K Dupré, p. 30
- Variant translation: See this egg. It is with this that all the schools of theology and all the temples of the earth are to be overturned.
  - As quoted in Diderot, Reason and Resonance (1982) by Élisabeth de Fontenay, p. 217

Addition aux Pensées philosophiques (1770)

Égaré dans une forêt immense pendant la nuit, je n’ai qu’une petite lumière pour me conduire. Survient un inconnu qui me dit : Mon ami, souffle ta bougie pour mieux trouver ton chemin. Cet inconnu est un théologien. — No VIII
- Wandering in a vast forest at night, I have only a faint light to guide me. A stranger appears and says to me: "My friend, you should blow out your candle in order to find your way more clearly." This stranger is a theologian. — Number VIII

Observations on the Drawing Up of Laws (1774)

A letter to Catherine the Great (1774), published in 1921, as translated in Selected Writings (1966) edited by Lester G. Crocker

Disturbances in society are never more fearful than when those who are stirring up the trouble can use the pretext of religion to mask their true designs.

[L]e philosophe n'a jamais tué de prêtres et le prêtre a tué beaucoup de philosophes...
- The philosopher has never killed any priests, whereas the priest has killed a great many philosophers.

In any country where talent and virtue produce no advancement, money will be the national god. Its inhabitants will either have to possess money or make others believe that they do. Wealth will be the highest virtue, poverty the greatest vice. Those who have money will display it in every imaginable way. If their ostentation does not exceed their fortune, all will be well. But if their ostentation does exceed their fortune they will ruin themselves. In such a country, the greatest fortunes will vanish in the twinkling of an eye. Those who don't have money will ruin themselves with vain efforts to conceal their poverty. That is one kind of affluence: the outward sign of wealth for a small number, the mask of poverty for the majority, and a source of corruption for all.

Morals are in all countries the result of legislation and government; they are not African or Asian or European: they are good or bad.

Patriotism is an ephemeral motive that scarcely ever outlasts the particular threat to society that aroused it.

The possibility of divorce renders both marriage partners stricter in their observance of the duties they owe to each other. Divorces help to improve morals and to increase the population.

The general interest of the masses might take the place of the insight of genius if it were allowed freedom of action.

The decisions of law courts should never be printed: in the long run, they form a counterauthority to the law.

Conversations with a Christian Lady (1774)

Conversations with a Christian Lady (Written in 1774, published 1777), as translated in Selected Writings (1966) edited by Lester G. Crocker

The blood of Jesus Christ can cover a multitude of sins, it seems to me.

The most dangerous madmen are those created by religion, and … people whose aim is to disrupt society always know how to make good use of them on occasion.

There is not a Musselman alive who would not imagine that he was performing an action pleasing to God and his Holy Prophet by exterminating every Christian on earth, while the Christians are scarcely more tolerant on their side.

Jacques le Fataliste (1796)

Jacques le Fataliste [Jacques the Fatalist] (1796)

Jacques said that his master said that everything good or evil we encounter here below was written on high.
- Prologue

How did they meet? By chance, like everybody … Where did they come from? From the nearest place. Where were they going? Do we know where we are going?
- Prologue

How easy it is to tell tales!

The first promise exchanged by two beings of flesh was at the foot of a rock that was crumbling into dust; they took as witness for their constancy a sky that is not the same for a single instant; everything changed in them and around them, and they believed their hearts free of vicissitudes. O children! always children!

Elements of Physiology (1875)

Elements of Physiology (written 1774-1780, published 1875)

Gaiety — a quality of ordinary men. Genius always presupposes some disorder in the machine.
- “Diseases"

Good music is very close to primitive language.
- "Correspondence of Ideas with the Motion of Organs"

The infant runs toward it with its eyes closed, the adult is stationary, the old man approaches it with his back turned.
- "Death"

It is said that desire is a product of the will, but the converse is in fact true: will is a product of desire.
- "Will, Freedom”

There is only one passion, the passion for happiness.
- "Will, Freedom”

The world is the house of the strong. I shall not know until the end what I have lost or won in this place, in this vast gambling den where I have spent more than sixty years, dicebox in hand, shaking the dice.
- Conclusion

Misattributed

Although a man may wear fine clothing, if he lives peacefully; and is good, self-possessed, has faith and is pure; and if he does not hurt any living being, he is a holy man.
- Gautama Buddha, as quoted in the Dhammapada.

Quotes about Diderot

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If I had believed him, everything would have been turned upside down... all would have been turned topsy-turvy to make room for impractical theories.
- Catherine the Great as quoted by Jackson J. Spielvogel

If ever anybody dedicated his whole life to the "enthusiasm for truth and justice" — using this phrase in the good sense — it was Diderot.
- Friedrich Engels in Diderot: Interpreter of Nature (London: 1937)

Diderot took the ground that, if orthodox religion be true Christ was guilty of suicide. Having the power to defend himself he should have used it.
- Robert Green Ingersoll in "Diderot" in The Great Infidels (1881); The Works of Robert G. Ingersoll Vol. III (1900), p. 367

Of course it would not do for the church to allow a man to die in peace who had added to the intellectual wealth of the world. The moment Diderot was dead, Catholic priests began painting and recounting the horrors of his expiring moments. They described him as overcome with remorse, as insane with fear; and these falsehoods have been repeated by the Protestant world, and will probably be repeated by thousands of ministers after we are dead.
The truth is, he had passed his threescore years and ten. He had lived for seventy-one years. He had eaten his supper. He had been conversing with his wife. He was reclining in his easy chair. His mind was at perfect rest. He had entered, without knowing it, the twilight of his last day. Above the horizon was the evening star, telling of sleep. The room grew still and the stillness was lulled by the murmur of the street. There were a few moments of perfect peace. The wife said, "He is asleep." She enjoyed his repose, and breathed softly that he might not be disturbed. The moments wore on, and still he slept. Lovingly, softly, at last she touched him. Yes, he was asleep. He had become a part of the eternal silence.
- Robert Green Ingersoll in "Diderot" in The Great Infidels (1881); The Works of Robert G. Ingersoll Vol. III (1900), p. 367

I don't understand how a man of good sense can accept for a single moment the sentence of the philosopher Diderot. It may well be high-sounding and incisive, it is nonetheless absurd and false. An who does not see, on the contrary, that it is not possible for the wicked man to love living alone and with himself? He would feel himself in company that is too bad, he would be too ill at ease, he would not be able to bear it for very long, or else, with his dominant passion remaining idle, it would have to die out and he would become good again. Amour-propre, the principle of all wickedness, is revived and thrives in society, which cause it to be born and where one is forced to compare oneself at each instant. It languishes and dies for want of nourishment in solitude. Whoever suffices to himself does not want to harm anyone at all. This maxim is less resounding and less arrogant, but more sensible and more just than that of the philosopher Diderot, and preferable at least in that it does not tend to offend anyone.
- Jean-Jacques Rousseau, Dialogues: Rousseau Judge of Jean-Jacques (published 1782), Second Dialogue

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