Rejoice in the LORD, O you righteous: for praise is fitting for the upright.
Read Chapter 33
Augustine of Hippo
AD 430
1. "Rejoice in the Lord, O ye rigtheous:" rejoice, O ye righteous, not in yourselves, for that is not safe; but in the Lord. "For praise is comely to the upright" (ver. 1): these praise the Lord, who submit themselves unto the Lord; for else they are distorted and perverse.
David. There is no title in Hebrew; and the Greek copies vary. This psalm may be considered as a continuation of the former, with the last verse of which it may be well connected. (Calmet)
Some suppose that David composed it after he had been rescued from the giant Jesbibenob, ver. 16., and 1 Paralipomenon xx. 4. (Ferrand.)
It is not certain that he is the author; but as other psalms without a title are ascribed to him, we have no reason to deny that he wrote this. (Berthier)
Many explain it as a thanksgiving of Ezechias. (Theodoret)
But we need not refer it to any particular event. (Calmet)
Upright. But it is not seemly in the mouth of a sinner, Ecclesiasticus xv. 9., (Worthington) and Psalm lxix. 16. (Calmet)