The Daily Office · Isaiah 40:28–31
They shall exchange their strength
Isaiah 40:28–31
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What's happening here
Isaiah 40 opens the second half of the book, speaking to Judeans in exile — their temple burned, their leaders deported, their God apparently defeated. The prophet's answer is not a pep talk. He asks a long series of questions — "have you not known? have you not heard?" — pointing the weary back to the God who made the stars and calls each one by name. The promise at the end is small and exact: those who wait will not recover their own strength; they will receive a different one.
The word that matters
Hebrew · to exchange, to renew by substitution
"They that wait upon the LORD shall renew their strength" is a famous line, but the Hebrew verb is not "renew" in the sense of refreshing what you already had. It is chalaph — to exchange, to trade. The promise is not that you will get a second wind of your own energy. It is that when your strength runs out, a different strength will be given in its place.
Where else this shows up
2 Corinthians 4:16
Paul picks up the same theology: "though our outer self is wasting away, our inner self is being renewed day by day."
Isaiah 41:10
A few verses later, God offers the flip side: "I will strengthen you, I will help you, I will uphold you."
Philippians 4:13
"I can do all things through him who strengthens me" — Paul's shorthand for Isaiah's trade.