Charles H. Spurgeon on Psalms 33:1

Praise is comely for the upright. Praise is not comely for any but the godly. A profane man stuck with God's praise is like a dunghill stuck with flowers. Praise in the mouth of a sinner is like an oracle in the mouth of a fool: how uncomely is it for him to praise God, whose whole life is a dishonouring of God? It is as indecent for a wicked man to praise God, who goes on in sinful practices, as it is for an usurer to talk of living by faith, or for the devil to quote Scripture. The godly are only fit to be choristers in God's praise; it is called, "the garment of praise." Isa 61:3. This garment sits handsome only on a saint's back. Thomas Watson.