A Perfect Heart
It is possible to walk before the Lord with a perfect heart! God said to Abraham, "I am the Almighty God; walk before me, and be thou perfect" (Genesis 17:1).
God also said to the children of Israel, "Thou shalt be perfect with the Lord your God" (Deuteronomy 18:13). David determined in his heart to obey this command. He said, "I will behave myself wisely in a perfect way.... I will walk within my house with a perfect heart" (Psalm 101:2).