Old Testament

The Septuagint translates as χάρις the Hebrew word חֵ֖ן (ẖen) as found in Genesis 6:8^[15] to describe why God saved Noah from the flood.^[14] The Old Testament use of the word includes the concept that those showing favor do gracious deeds, or acts of grace, such as being kind to the poor and showing generosity.^[14] Descriptions of God's graciousness abound in the Torah/Pentateuch, for example in Deuteronomy 7:8^[16] and Numbers 6:24–27.^[17] In the Psalms, examples of God's grace include teaching the Law (Psalm 119:29)^[18] and answering prayers (Psalm 27:7).^[19][14] Another example of God's grace appears in Psalm 85, a prayer for restoration, forgiveness, and the grace and mercy of God to bring about new life following the Exile.

Sanctifying and actual grace

According to a commonly accepted categorization, made by St. Thomas Aquinas in his Summa Theologiae, grace can be given either to make the person receiving it pleasing to God (gratia gratum faciens) – so that the person is sanctified and justified – or else to help the receiver lead someone else to God (gratia gratis data).^[33][a] The former type of grace, gratia gratum faciens, in turn, can be described as sanctifying (or habitual) grace – when it refers to the divine life which, according to the Church, infuses a person's soul once they are justified; or else as actual grace – when it refers to those punctual (not habitual) helps that are directed to the production of sanctifying grace where it does not already exist, or its maintenance and increase it where it is already present. According to the Catechism of the Catholic Church:

Sanctifying grace is an habitual gift, a stable and supernatural disposition that perfects the soul itself to enable it to live with God, to act by his love. Habitual grace, the permanent disposition to live and act in keeping with God's call, is distinguished from actual graces which refer to God's interventions, whether at the beginning of conversion or in the course of the work of sanctification.^[34]

— Catechism of the Catholic Church

The infusion of sanctifying grace, says the Church, transforms a sinner into a holy child of God, and in this way a person participates in the Divine Sonship of Jesus Christ and receives the indwelling of the Holy Spirit.^[35] For this reason, sanctifying grace is also called deifying grace and sanctification is deification.^[36]

Sanctifying grace remains permanently in the soul as long as one does not reject one's adopted sonship by committing a mortal sin, which severs one's friendship with God. Less serious sins, venial sin, although they "allow charity to subsist, they offend and wound it."^[37] However, God is infinitely merciful, and sanctifying grace can always be restored to the penitent heart, normatively in the Sacrament of Reconciliation (or Sacrament of Penance).^[38]

Augustine versus Pelagius

In the early 5th century, Pelagius, an ascetic who is said to have come from Britain,^[39] was concerned about the moral laxity of society that he witnessed in Rome. He blamed this laxity on the theology of divine grace preached by Augustine of Hippo, among others.^[40] He strongly affirmed that humans had free will and were able to choose good as well as evil. Augustine, drawing on the exaggerated statements of the followers of Pelagius rather than on Pelagius' own writings,^[41] began a debate that was to have long-reaching effects on subsequent developments of the doctrine in Western Christianity. Pelagianism was repudiated by the Council of Carthage in 418, largely at Augustine's insistence. However, what Pelagius taught was likely what has come to be called semi-pelagianism.^[42]

In semi-Pelagian thought, both God and the human person always participate in the salvation process. Humans make free will choices, which are aided by God through creation, natural grace, "supernatural" grace, and God's restrictions on demonic influences. God continually brings the human person to real choices, which God also aids, in the process of spiritual growth and salvation. Semi-Pelagianism involves synergism, which is the traditional patristic doctrine. John Cassian, in continuity with patristic doctrine, taught that though grace is required for persons to save themselves at the beginning, there is no such thing as total depravity, but there remains a moral or noetic ability within humans that is unaffected by original sin, and that persons must work together (synergism) with divine grace to be saved.^[43] This position is held by the Eastern Orthodox Church and by many Reformed Protestants,^[44][45] and in the Catholic Church has been especially associated with the Society of Jesus.^[46][47]

Catholic versus Protestant

In 1547, the Council of Trent, which sought to address and condemn Protestant objections, aimed to purge the Roman Catholic Church of controversial movements and establish an orthodox Roman Catholic teaching on grace and justification, as distinguished from the Protestant teachings on those concepts. It taught that justification and sanctification are elements of the same process.^[48] The grace of justification is bestowed through the merit of Christ's passion,^[49] without any merits on the part of the person justified, who is enabled to cooperate only through the grace of God.^[49] The grace of justification may be lost through mortal sin, but can also be restored by the sacrament of Penance.^[49] The sacraments are, together with revealed truth, the principal means of the grace, a treasury of grace, that Christ has merited by his life and death and has given to the Church.^[22] This does not mean that other groups of Christians have no treasury of grace at their disposal,^[50] for, as the Second Vatican Council declared, "many elements of sanctification and of truth are found outside of (the Catholic Church's) visible structure".^[51]

Jansenists versus Jesuits

At about the same time that Calvinists and Arminians were debating the meaning of grace in Protestantism, in Catholicism a similar debate was taking place between the Jansenists and the Jesuits. Cornelius Jansen's 1640 work Augustinus sought to refocus Catholic theology on the themes of original sin, human depravity, the necessity of divine grace, and predestination, as he found them in the works of Augustine. The Jansenists, like the Puritans, believed themselves to be members of a gathered church called out of worldly society, and banded together in institutions like the Port-Royal convents seeking to lead lives of greater spiritual intensity. Blaise Pascal attacked what he called moral laxity in the casuistry of the Jesuits. Jansenist theology remained a minority party within Catholicism, and during the second half of the 17th and 18th centuries it was condemned as a heresy for its similarities to Calvinism, though its style remained influential in ascetic circles.

Grace and merit

Citing the Council of Trent, the Catechism of the Catholic Church states:

With regard to God, there is no strict right to any merit on the part of man. Between God and us there is an immeasurable inequality, for we have received everything from him, our Creator. The merit of man before God in the Christian life arises from the fact that God has freely chosen to associate man with the work of his grace. The fatherly action of God is first on his own initiative, and then follows man's free acting through his collaboration, so that the merit of good works is to be attributed in the first place to the grace of God, then to the faithful. Man's merit, moreover, itself is due to God, for his good actions proceed in Christ, from the predispositions and assistance given by the Holy Spirit. [...] The charity of Christ is the source in us of all our merits before God. Grace, by uniting us to Christ in active love, ensures the supernatural quality of our acts and consequently their merit before God and before men. The saints have always had a lively awareness that their merits were pure grace.^[52]

— Catechism of the Catholic Church

John Cassian

In the works of John Cassian (c. 360–435 AD), Conference XIII recounts how the wise monk Chaeremon, of whom he is writing, responded to puzzlement caused by his own statement that "man even though he strive with all his might for a good result, yet cannot become master of what is good unless he has acquired it simply by the gift of Divine bounty and not by the efforts of his own toil" (Chapter 1). In Chapter 11, Cassian presents Chaeremon as speaking of the cases of "Paul the persecutor" and "Matthew the publican" as difficulties for those who say "the beginning of free will is in our own power", and the cases of Zaccheus and the good thief on the cross as difficulties for those who say "the beginning of our free will is always due to the inspiration of the grace of God". Chaeremon thus concludes; "These two then; viz., the grace of God and free will seem opposed to each other, but really are in harmony, and we gather from the system of goodness that we ought to have both alike, lest if we withdraw one of them from man, we may seem to have broken the rule of the Church's faith: for when God sees us inclined to will what is good, He meets, guides, and strengthens us: for 'At the voice of thy cry, as soon as He shall hear, He will answer thee'; and: 'Call upon Me', He says, 'in the day of tribulation and I will deliver thee, and thou shalt glorify Me'. And again, if He finds that we are unwilling or have grown cold, He stirs our hearts with salutary exhortations, by which a good will is either renewed or formed in us."^[55]

Cassian did not accept the idea of total depravity, on which Martin Luther was to insist.^[56] He taught that human nature is fallen or depraved, but not totally. Augustine Casiday states that, at the same time, Cassian "baldly asserts that God's grace, not human free will, is responsible for 'everything [that] pertains to salvation' – even faith".^[57] Cassian pointed out that people still have moral freedom and one has the option to choose to follow God. Colm Luibhéid says that, according to Cassian, there are cases where the soul makes the first little turn,^[58] but according to Casiday's interpretation, any sparks of goodwill that may exist, not directly caused by God, are totally inadequate and only direct divine intervention ensures spiritual progress;^[59] and Lauren Pristas says that "for Cassian, salvation is, from beginning to end, the effect of God's grace".^[60]

Luther and Lutheran theology

Martin Luther's posting of his ninety-five theses to the church door in Wittenberg in 1517 was a direct consequence of the perfunctory sacramentalism and treasury doctrines of the medieval church. The act was precipitated by the arrival of Johann Tetzel, authorized by the Vatican to sell indulgences.

The effectiveness of these indulgences was predicated on the doctrine of the treasury of grace proclaimed by Pope Clement VI. The theory was that merit earned by acts of piety could augment the believer's store of sanctifying grace. Gifts to the Church were acts of piety. The Church, moreover, had a treasury full of grace above and beyond what was needed to get its faithful into heaven. The Church was willing to part with some of its surplus in exchange for earthly gold. Martin Luther's anger against this practice, which seemed to him to involve the purchase of salvation, began a swing of the pendulum back towards the Pauline vision of grace, as opposed to James's.

Luther taught that men were helpless and without a plea before God's justice, and their acts of piety were utterly inadequate before his infinite holiness. Were God only just, and not merciful, everyone would go to hell, because everyone, even the best of mankind, deserves to go to hell. Mankind's inability to achieve salvation by its own effort suggests that even the best intentions are somehow tainted by mankind's sinful nature. This doctrine is sometimes called total depravity, a term derived from Calvinism and its relatives.

It is by faith alone (sola fide) and by grace alone (sola gratia) that men are saved. Good works are something the believers should undertake out of gratitude towards their Savior; but they are not sufficient for salvation and cannot earn anyone salvation; there is no room for the notion of "merit" in Luther's doctrine of redemption. (There may, however, be degrees of reward for the redeemed in heaven.) Only the unearned, unmerited grace of God can save anyone. No one can have a claim of entitlement to God's grace, and it is only by his generosity that salvation is even possible.

As opposed to the treasury of grace from which believers can make withdrawals, in Lutheranism salvation becomes a declaration of spiritual bankruptcy, in which penitents acknowledge the inadequacy of their own resources and trust only in God to save them. Accepting Augustine's concern for legal justification as the base metaphor for salvation, the believers are not so much made righteous in Lutheranism as they are considered covered by Christ's righteousness. Acknowledging that they have no power to make themselves righteous, the penalty for their sins is discharged because Jesus has already paid for it with his blood. His righteousness is credited to those who believe in and thus belong to him.

Calvin and Reformed theology

Calvin and Luther believed free will does not co-operate with God's grace which, according to them, cannot be rejected (see monergism). The Lutheran Augsburg Confession says of baptism, "Lutherans teach that it is necessary to salvation and that by baptism the grace of God is offered and that children are to be baptized, who by baptism, being offered to God, are received into God's favor."^[61] The French reformer John Calvin expanded and further developed these Augustinian themes in his systematic Institutes of the Christian Religion in 1536.

The logical structure of Calvinism is often expressed as the acronym, TULIP. These five categories do not comprise Calvinism in its entirety; they simply encapsulate its central, definitive doctrines.^[62]

• Total depravity (also known as total inability, which is inexorably tied to a strong doctrine of original sin as having completely enslaved the human will)
• Unconditional election
• Limited Atonement (also known as definite atonement or particular redemption)
• Irresistible Grace
• Perseverance of the Saints (colloquially known as "once saved, always saved" or, as interpreted a distinct way among Reformed or Strict Baptists as well as non-Calvinist General Baptists, eternal security)

The notion that God has foreordained who will be saved is generally called predestination. The concept of predestination peculiar to Calvinism, "double-predestination", (in conjunction with limited atonement) is the most controversial expression of the doctrine. According to Reformed theology, the "good news" of the gospel of Christ is that God has freely granted the gift of salvation to those the Holy Spirit causes to believe; what he freely grants to some (the "elect" individuals), he withholds from others (the "reprobate" individuals).

Calvin sought to provide assurance to the faithful that God would actually save them. His teaching implied what came to be known as the doctrine of the perseverance of the saints, the notion that God would actually save those who were his Elect. The actual status and ultimate state of any man's soul were unknown except to God. When assurance of election was rigorously pressed as an experience to be sought, especially by the Puritans, this led to a legalism as rigid as the one Protestantism sought to reject, as men were eager to demonstrate that they were among the chosen by the conspicuous works-righteousness of their lives.

The relatively radical positions of Reformed theology provoked a strong reaction from both Roman Catholics and Lutherans.

Classical and Wesleyan Arminian theology

In the beginning of the 17th century, the Dutch theologian Jacobus Arminius formulated Arminianism and departed from Calvin's theology in particular on election and predestination.^[63] Arminianism affirms the compatibility between human free will and divine foreknowledge, and its incompatibility with theological determinism.^[64] Predestination in Arminianism is based on divine foreknowledge, unlike in Calvinism.^[65] Thus, the offer of salvation through grace does not act irresistibly in a purely cause-effect, deterministic method but rather in an influence-and-response fashion that can be both freely accepted and freely denied.^[66] In Arminianism, God takes initiative in the salvation process and his grace comes to all people. This is done through prevenient grace which acts on all people to convince them of the Gospel, draw them strongly towards salvation, and enable the possibility of sincere faith.^[67] As Roger Olson put it: "[Arminius]' evangelical synergism reserves all the power, ability and efficacy in salvation to grace, but allows humans the God-granted ability to resist or not resist it. The only "contribution" humans make is nonresistance to grace."^[68]

Later, John Wesley also rejected the Calvinist doctrine of predestination, and had the same Arminian understanding as expressed in Wesleyan theology. It remains the standard teaching of Methodist churches.^[69] Wesley also appealed to prevenient grace, stating that God makes the initial move in salvation, but human beings are free to respond or reject God's graceful initiative.^[70] The doctrine of prevenient grace remains one of Methodism's most important doctrines.^[69]

John Wesley distinguished three kinds of divine grace in the process of salvation: 1. "Prevenient grace" which is an enabling grace preceding regeneration ("prevenient" means preceding). 2. "Justifying grace" which can bring regeneration but which is resistible. 3. "Sustaining grace" which helps a person to remain into regeneration, and to reach sanctification and final salvation.^[70] In particular Wesley taught that Christian believers are to participate in the means of grace and to continue to grow in the Christian life, assisted by God's sustaining grace.^[71]

The Protestant Reformation and ecclesiology

Protestantism in all three major schools of theology – Lutheran, Calvinist, and Arminian – emphasize God's initiative in the work of salvation, which is achieved by grace alone through faith alone, in either stream of thinking – although these terms are understood differently, according to the differences in systems.

Classical Calvinism teaches that the sacraments are "signs and seals of the covenant of grace" and "effectual means of salvation", and Lutheranism teaches that new life, faith, and union with Christ are granted by the Holy Spirit working through the sacraments. However, for a large portion of the Protestant world, the sacraments largely lost the importance that Luther (and to a slightly lesser degree, Calvin) attributed to them. This happened under the influence of ideas of the Anabaptists which were ideas also seen in the Donatists in North Africa in 311 AD,^[72] and these ideas then spread to Calvinists through the Congregationalist and Baptist movements, and to Lutherans through Pietism (although much of Lutheranism recoiled against the Pietist movement after the mid-19th century).

Where the sacraments are de-emphasized, they become "ordinances", acts of worship which are required by Scripture, but whose effect is limited to the voluntary effect they have on the worshipper's soul. This belief finds expression in the Baptist and Anabaptist practice of believer's baptism, given not to infants as a mark of membership in a Christian community, but to adult believers after they have achieved the age of reason and have professed their faith. These ordinances are never considered works-righteousness. The ritual as interpreted in light of such ideas does not at all bring about salvation, nor does its performance bring about the forgiveness of sins; the forgiveness which the believer has received by faith is merely pictured, not effectively applied, by baptism; salvation and participation in Christ is memorialized ("this do in remembrance of me" in the Lord's Supper and baptism picturing a Christian's rebirth as death to sin and alive in Christ), not imparted, by the Eucharist. The Church to the Baptists becomes an assembly of true believers in Christ Jesus who gather together for worship and fellowship and remembering what Christ did for them.