Isaías 40

It is he who gives strength to the weary, and it is he who increases fortitude and strength in those who are failing.

El da esfuerzo al cansado, y multiplica las fuerzas al que no tiene ningunas.

He giveth power to the faint; and to them that have no might he increaseth strength.

He gives power to the weak. He increases the strength of him who has no might.