Isaiah 40:27-31  New International Version

²⁷ Why do you complain, Jacob?
    Why do you say, Israel,
“My way is hidden from the Lord;
    my cause is disregarded by my God”?^(A)
28 Do you not know?
    Have you not heard?^(B)
The Lord is the everlasting^(C) God,
    the Creator^(D) of the ends of the earth.^(E)
He will not grow tired or weary,^(F)
    and his understanding no one can fathom.^(G)
29 He gives strength^(H) to the weary^(I)
    and increases the power of the weak.
³⁰ Even youths grow tired and weary,
    and young men^(J) stumble and fall;^(K)
31 but those who hope^(L) in the Lord
    will renew their strength.^(M)
They will soar on wings like eagles;^(N)
    they will run and not grow weary,
    they will walk and not be faint.^(O)