John Calvin Commentary Psalms 119:7

"I will give thanks unto thee with uprightness of heart, When I learn thy righteous judgments." — Psalms 119:7 (ASV)

I will praise you. He affirms it to be a singular instance of the loving-kindness of God if a person has become considerably proficient in His law. As a token and testimony of this, he here offers the giving of thanks to God; as if he were to say, "Lord, you will confer upon me an inestimable blessing if you instruct me in your law."

It follows, therefore, that nothing in this life is more to be desired than this; and my fervent prayer is that we may be truly and fully convinced of its truth. For while carefully searching for such things as we consider advantageous to us, we do not overlook any earthly convenience, and yet we neglect that which is of utmost importance. The phrase, the judgments of your righteousness, means the same as the commandments, in which perfect righteousness is contained. Thus, the prophet commends God’s law because of the complete perfection of the doctrine contained in it. From this verse we learn that no one will praise God sincerely and wholeheartedly except the one who has become so proficient in His school as to shape his life in submission to Him. It is vain to pretend to praise God with the mouth and the tongue if we dishonor Him by our life. Hence the prophet very rightly shows here that the fruit of genuine piety consists in celebrating the praises of God without hypocrisy.