Isaiah 40:28-30 Darby Translation (DARBY)
28 Dost thou not know, hast thou not heard, that the everlasting God, Jehovah, the Creator of the ends of the earth, fainteth not nor tireth? There is no searching of his understanding.
29 He giveth power to the faint; and to him that hath no might he increaseth strength.
30 Even the youths shall faint and shall tire, and the young men shall stumble and fall;