He giveth power to the faint; and to them that have no might he increaseth strength.
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Isaiah 40:27-31
Tyndale Open Study Notes (CC BY-SA 4.0).
40:29 The weak in this context are those who face persecution or oppression (such as the Babylonian exile); the Lord is their only recourse (see 49:4-5; 50:4; Pss 68:9; 119:28).
Other Bible passages linked to this one, most cited first.
Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
I can do all things through Christ which strengtheneth me.
And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me. Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ’s sake: for when I am weak, then am I strong.
Strengthened with all might, according to his glorious power, unto all patience and longsuffering with joyfulness;
And I will strengthen them in the LORD; and they shall walk up and down in his name, saith the LORD.
For I have satiated the weary soul, and I have replenished every sorrowful soul.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.