Do good, O Lord, unto those that be good ... — To the good; to the pious. Let them be under the divine protection. Possibly this is…

Do good, O LORD, unto those that be good, and to them that are upright in their hearts.

True believers are good; especially are the…

Do good, O Jehovah, to the good. The Prophet has already promised to all the faithful the timely help of God; but still he resorts to pray…

Do good, O Lord, unto [those that be] good
That are made so by the Spirit and grace of God; for none are naturally g…

God's promises should enliven our prayers. The way of holiness is straight; there are no windings or deviations in it. But the ways of sinners are …