'Assurance' in the Bible
Your life shall hang in doubt before you; day and night you shall be worried, and have no assurance of your life.
I will bring back all the people to you. [The removal of] the man whom you seek is the assurance that all will return; and all the people will be at peace.
Let my mournful cry and supplication come [near] before You, O Lord; give me understanding (discernment and comprehension) according to Your word [of assurance and promise].
Thereupon I [Jeremiah] awoke and looked, and my [trancelike] sleep was sweet [in the assurance it gave] to me.
For the [uttered] words that You gave Me I have given them; and they have received and accepted [them] and have come to know positively and in reality [to believe with absolute assurance] that I came forth from Your presence, and they have believed and are convinced that You did send Me.
Because He has fixed a day when He will judge the world righteously (justly) by a Man Whom He has destined and appointed for that task, and He has made this credible and given conviction and assurance and evidence to everyone by raising Him from the dead.
It was with assurance of this that I wanted and planned to visit you first [of all], so that you might have a double favor and token of grace (goodwill).
But we do [ strongly and earnestly] desire for each of you to show the same diligence and sincerity [all the way through] in realizing and enjoying the full assurance and development of [your] hope until the end,
Let us all come forward and draw near with true (honest and sincere) hearts in unqualified assurance and absolute conviction engendered by faith (by that leaning of the entire human personality on God in absolute trust and confidence in His power, wisdom, and goodness), having our hearts sprinkled and purified from a guilty (evil) conscience and our bodies cleansed with pure water.
Now faith is the assurance (the confirmation, the title deed) of the things [we] hope for, being the proof of things [we] do not see and the conviction of their reality [faith perceiving as real fact what is not revealed to the senses].
For all that is in the world -- "the lust of the flesh [craving for sensual gratification] and the lust of the eyes [greedy longings of the mind] and the pride of life [assurance in one's own resources or in the stability of earthly things] -- "these do not come from the Father but are from the world [itself].
And now, little children, abide (live, remain permanently) in Him, so that when He is made visible, we may have and enjoy perfect confidence (boldness, assurance) and not be ashamed and shrink from Him at His coming.
And, beloved, if our consciences (our hearts) do not accuse us [if they do not make us feel guilty and condemn us], we have confidence (complete assurance and boldness) before God,
In this [union and communion with Him] love is brought to completion and attains perfection with us, that we may have confidence for the day of judgment [with assurance and boldness to face Him], because as He is, so are we in this world.
And this is the confidence (the assurance, the privilege of boldness) which we have in Him: [we are sure] that if we ask anything (make any request) according to His will (in agreement with His own plan), He listens to and hears us.
I, Jesus, have sent My messenger (angel) to you to witness and to give you assurance of these things for the churches (assemblies). I am the Root (the Source) and the Offspring of David, the radiant and brilliant Morning Star.