The five foregoing psalms were all of a piece, all full of prayers; this, and the five that follow it to the end of the book, are all of a piece too, all full of praises; and though only this is entitled David’s psalm yet we have no reason to think but that they were all his as well as all the foregoing prayers. And it is observable, 1. That after five psalms of prayer follow six psalms of praise; for those that are much in prayer shall not want matter for praise, and those that have sped in prayer must abound in praise. Our thanksgivings for mercy, when we have received it, should even exceed our supplications for it when we were in pursuit of it. David, in the last of his begging psalms, had promised to praise God (Ps. 145:9), and here he performs his promise. 2. That the book of Psalms concludes with psalms of praise, all praise, for praise, is the conclusion of the whole matter; it is that in which all the psalms centre. And it intimates that God’s people, towards the end of their life, should abound much in praise, and the rather because, at the end of their life, they hope to remove to the world of everlasting praise, and the nearer they come to heaven the more they should accustom themselves to the work of heaven. This is one of those psalms which are composed alphabetically (as Ps. 25 and 34, etc.), that it might be the more easily committed to memory, and kept in mind. The Jewish writers justly extol this psalm as a star of the first magnitude in this bright constellation; and some of them have an extravagant saying concerning it, not much unlike some of the popish superstitions, That whosoever will sing this psalm constantly three times a day shall certainly be happy in the world to come. In this psalm, I. David engages himself and others to praise God, Ps. 145:1, 2, 4-7, 10-12. II. He fastens upon those things that are proper matter for praise, God’s greatness (Ps. 145:3), his goodness (Ps. 145:8, 9), the proofs of both in the administration of his kingdom (Ps. 145:13), the kingdom of providence (Ps. 145:14-16), the kingdom of grace (Ps. 145:17-20), and then he concludes with a resolution to continue praising God (Ps. 145:21) with which resolution our hearts must be filled, and in which they must be fixed, in singing this psalm.