Psalm 73:26 in the World English Bible
My flesh and my heart fails, but God is the strength of my heart and my portion forever.
Context
25 Whom have I in heaven but thee? and there is none upon earth that I desire beside thee.
26 My flesh and my heart faileth: but God is the strength of my heart, and my portion for ever.
27 For, lo, they that are far from thee shall perish: thou hast destroyed all them that go a whoring from thee.