David was certainly the penman of this psalm, and it has in it the genuine spirit of the man after God’s own heart; it is a solemn vow which he made to God when he took upon him the charge of a family and of the kingdom.

Mercy and Judgment; David’s Pious Resolution. A psalm of David. 1 I will sing of mercy and judgment: unto thee, O Lord, will I sing. 2 I will behave myself wisely in a perfect way. O when wilt thou come unto me? I will walk within my house with a perfect heart.