Salmos 51

Salmos 51:10

And that also which was said by the Lord unto Samuel, "I have found a man according to My heart," testified unto the purity of David's heart, and it is well known that simplicity is born of purity of heart. And again David himself asked in prayer, "Create in me a clean heart, O God." — 13 Ascetic Discourses, Discourse 4 -- On Faith: First Discourse on Simplicity