'Assurance' in the Bible

Your life will hang in doubt before you; night and day you will be filled with anxiety and have no assurance of living.

and I will bring all the people [who follow David] back to you. The return of everyone depends on the [death of the] man you are seeking; then all the people will be at peace [and accept you as king].”

Tav.Let my [mournful] cry come before You, O Lord;Give me understanding [the ability to learn and a teachable heart] according to Your word [of promise].

At this I (Jeremiah) awoke and looked, and my [trancelike] sleep was sweet [in the assurance it gave] to me.

For the words which You gave Me I have given them; and they received and accepted them and truly understood [with confident assurance] that I came from You [from Your presence], and they believed [without any doubt] that You sent Me.

because He has set a day when He will judge the inhabited world in righteousness by a Man whom He has appointed and destined for that task, and He has provided credible proof to everyone by raising Him from the dead.”

It was with this confidence that I planned at first to visit you, so that you might receive twice a token of grace;

And we desire for each one of you to show the same diligence [all the way through] so as to realize and enjoy the full assurance of hope until the end,

let us approach [God] with a true and sincere heart in unqualified assurance of faith, having had our hearts sprinkled clean from an evil conscience and our bodies washed with pure water.

Now faith is the assurance (title deed, confirmation) of things hoped for (divinely guaranteed), and the evidence of things not seen [the conviction of their reality—faith comprehends as fact what cannot be experienced by the physical senses].

For all that is in the world—the lust and sensual craving of the flesh and the lust and longing of the eyes and the boastful pride of life [pretentious confidence in one’s resources or in the stability of earthly things]—these do not come from the Father, but are from the world.

Now, little children (believers, dear ones), remain in Him [with unwavering faith], so that when He appears [at His return], we may have [perfect] confidence and not be ashamed and shrink away from Him at His coming.

Beloved, if our heart does not convict us [of guilt], we have confidence [complete assurance and boldness] before God;

In this [union and fellowship with Him], love is completed and perfected with us, so that we may have confidence in the day of judgment [with assurance and boldness to face Him]; because as He is, so are we in this world.

This is the [remarkable degree of] confidence which we [as believers are entitled to] have before Him: that if we ask anything according to His will, [that is, consistent with His plan and purpose] He hears us.

“I, Jesus, have sent My angel to testify to you and to give you assurance of these things for the churches. I am the Root (the Source, the Life) and the Offspring of David, the radiant and bright Morning Star.”