Be glad in the Lord, and rejoice, ye righteous. David's psalms almost always end with a note of joy, or at any rate in a tone that is cheerful and encouraging. The present psalm, though reckoned among the penitential ones, both begins and ends with joyful utterances. In Psalms 32:1, Psalms 32:2 David pours forth the feeling of gladness which fills his own heart. Here he calls upon the "righteous" generally, who yet need forgiveness, to rejoice with him. And shout for joy, all ye that are upright in heart. All ye, i.e; who are honest and sincere in your endeavours after well-doing. The phrase explains the "righteous" of the preceding hemistich.
HOMILETICS