Psalms 9:2

2.I will rejoice and exult in thee. Observe how the faithful praise God sincerely and without hypocrisy, when they do not rest on themselves for happiness, and are not intoxicated with foolish and carnal presumption, but rejoice in God alone; which is nothing else than to seek the matter of their joy from the favor of God, and from no other source, since in it perfect happiness consists. I will rejoice in thee We ought to consider how great is the difference and opposition between the character of the joy which men endeavor to find in themselves, and the character of the joy which they seek in God. David, the more forcibly to express how he renounces every thing which may keep hold of or occupy him with vain delight, adds the word exult, by which he means that he finds in God a full and an overflowing abundance of joy, so that he is not under the necessity of seeking even the smallest drop in any other quarter. Moreover, it is of importance to remember what I have previously observed, that David sets before himself the testimonies of the divine goodness which he had formerly experienced, in order to encourage himself with the more alacrity to lay open his heart (163) to God, and to present his prayers before him. He who begins his prayer by affirming that God is the great source and object of his joy, fortifies himself before-hand with the strongest confidence, in presenting his supplications to the hearer of prayer.