Psalm 73:26 in the King James Version
My flesh and my heart faileth: but God is the strength of my heart, and my portion for ever.
Context
25 Whom do I have in heaven? There is no one on earth whom I desire besides you.
26 My flesh and my heart fails, but God is the strength of my heart and my portion forever.
27 For, behold, those who are far from you shall perish. You have destroyed all those who are unfaithful to you.