He giveth power to the faint; and to them that have no might he increaseth strength.
29. He giveth power to the faint. The Prophet now applies to the present subject the general statements which he made; for we have said that his intention was to give warmer encouragement to the people, and to lead them to cherish better hope.
These captives shame themselves by their own words. They bear the names Jacob and Israel from one who found God faithful in all straits, yet now they speak as if the Lord ignores their case. It is bad to harbor such thoughts in the mind; it is worse to speak them aloud and make them doctrine.
AI summary
Commenting on Isaiah 40:27-31
Even the youths shall faint and be weary,.... Such as are in the prime of their strength, and glory in it, yet through the hand of God upon them, by one disease or another, their strength is weakened in the way; or they meet with that which they are not equal to, and sink under, and are discouraged, and obliged to desist.