לְדָוִ֗ד מַ֫שְׂכִּ֥יל אַשְׁרֵ֥י נְֽשׂוּי־פֶּ֗שַׁע כְּס֣וּי חֲטָאָֽה׃
[A Psalm] of David. Maschil. Happy is he whose transgression is forgiven, whose sin is pardoned.
Read kabbalistic (mystical) interpretation of Psalms 32:1: and classical mystical sources.