Isaiah 40:28-31

40:28 Hast thou not known? hast thou not heard, [that] the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? [there is] no searching of his understanding. 40:29 He giveth power to the faint; and to [them that have] no might he increaseth strength. 40:30 Even the youths shall faint and be weary, and the young men shall utterly fall: 40:31 But they that wait upon the LORD shall renew [their] strength; they shall mount up with wings as eagles; they shall run, and not be weary; [and] they shall walk, and not faint.