I Will Bless The Lord.

David engages and excites himself to praise God. Though it was his fault that he changed his behaviour, yet it was God's mercy that he escaped, and the mercy was so much the greater in that God did not deal with him according to the desert of his dissimulation, and we must in every thing give thanks.

He resolves, that he will praise God constantly: I will bless the Lord at all times, upon all occasions. He resolves to keep up stated times for this duty, to lay hold of all opportunities for it, and to renew his praises upon every fresh occurrence that furnished him with matter. If we hope to spend our eternity in praising God, it is fit that we should spend as much as may be of our time in this work.

That he will praise him openly: His praise shall continually be in my mouth. Thus he would show how forward he was to own his obligations to the mercy of God and how desirous to make others also sensible of theirs.

That he will praise him heartily: "My soul shall make her boast in the Lord, in my relation to him, my interest in him, and expectations from him." It is not vainglory to glory in the Lord. - Matthew Henry