Who can say, I have made my heart clean? — Though we may have done our best by self-examination and confession, and repentance and trust in the atoning blood of Christ to obtain remission of sin, still the heart is so deceitful (Jeremiah 17:9), sins may so easily have escaped our notice (Psalms 19:12; 1 Corinthians 4:4), that satisfaction with ourselves ought never to be allowed (Romans 11:20).
Related Commentaries of Proverbs 20:9
Proverbs 20:9
9 Who can say, I have made my heart clean, I am pure from my sin?