12. I will praise thee, O Lord my God! David engages, when he shall have experienced God to be in all respects a beneficent father, to yield to him the tribute of gratitude. He expressed in the preceding verse a desire to have his heart united to God, that he might fear him; and now he affirms it to be his resolution to publish or celebrate his praises, not only with the mouth or tongue, but also with sincere affection of heart; yea, even to continue with steadfast perseverance in that exercise.