Bible Verses about “strength and weak”

“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.”

“Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.”

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