Here, 1. David gives glory to God: "Blessed art thou, O Lord! Thou art
infinitely happy in the enjoyment of thyself and hast no need of me or
my services; yet thou art pleased to reckon thyself honoured by them;
assist me therefore, and then accept me." In all our prayers we should
intermix praises. 2. He asks grace from God: "Teach me thy statutes;
give me to know and do my duty in every thing. Thou art the fountain of
all blessedness; O let me have this drop from that fountain, this
blessing from that blessedness: Teach me thy statutes, that I may know
how to bless thee, who art a blessed God, and that I may be blessed in
thee."