Psalms 32:1

Psalms 32:1. Blessed is he whose transgression is forgiven, whose sin is covered.

The Lord can bless the man who is full of sin only when his sin is covered by the atonement - the propitiation - which hides his sin even from the sight of God; and he is a truly blessed man who, although he knows himself to be a sinner, also knows that his sin is forgiven and covered.