2 Corinthians 12:9 (KJV) — “And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness.”
Psalm 73:26 (KJV) — “My flesh and my heart faileth: but God is the strength of my heart, and my portion for ever.”
Isaiah 40:29 (KJV) — “He giveth power to the faint; and to them that have no might he increaseth strength.”