Psalms 37:3

“But let the righteous be glad, etc.] At the incarnation of Christ, which is matter of joy to all people that believe in him; as did Zacharias and Elisabeth, who were both righteous, and also Simeon; and at his resurrection from the dead, since it is for their justification, by which they are denominated righteous; as did the disciples of Christ, and as do saints in all ages; who know the power of his resurrection, and the influence it has on the regeneration of their souls, the justification of their persons now, and the resurrection of their bodies hereafter; and at the destruction of the enemies of Christ and theirs; let them rejoice before God; in the presence of him; enjoying communion…”

“Trust--sure of safety. shalt thou dwell--or, "dwell thou"; repose quietly. verily . . . fed--or, "feed on truth," God's promise (Psa 36:5; compare Hos 12:1).”

“Trust in the Lord - Confide in him; rest on him. Instead of allowing the mind to be disturbed and sad, because there are wicked men upon the earth; because they are prosperous and apparently happy; because they may injure you in your person or reputation Psalms 37:6, calmly confide in God. Leave all this in his hands. Feel that he rules, and that what he permits is wisely permitted; and that whatever may occur, it will all be overruled for his own glory and the good of the universe. And do good - Be engaged always in some work of benevolence. (a) If there are wicked men in the world, if wickedness abounds around us, there is the more reason for our endeavoring to do good. If others are doing…”

“37:3-4 The antidote to irritability and envy (37:1) is trust in the Lord. 37:3 To do good means cultivating a devotion to wisdom (see 34:14; Prov 3:5-7).”

“Trust: Psa 4:5, Psa 26:1; Isa 1:16-19, Isa 50:10; Jer 17:7, Jer 17:8; Co1 15:57, Co1 15:58; Heb 6:10-12 so shalt: Gen 26:2; Sa1 26:19; Heb 11:13-16 verily: Heb. in truth, or stableness be fed: Psa 33:19, Psa 34:9, Psa 34:10; Mat 6:31-33; Luk 22:35 Psalms 37:4”

“The "land" is throughout this Psalm the promised possession (Heilsgut), viz., the land of Jahve's presence, which has not merely a glorious past, but also a future rich in promises; and will finally, ore perfectly than under Joshua, become the inheritance of the true Israel. It is therefore to be explained: enjoy the quiet sure habitation which God gives thee, and diligently cultivate the virtue of faithfulness. The two imperatives in Psa 37:3, since there are two of them (cf. Psa 37:27) and the first is without any conjunctive Waw, have the appearance of being continued admonitions, not promises; and consequently אמוּנה is not an adverbial accusative as in Psa 119:75 (Ewald), but the object…”