Depart from evil, and do good. In this verse David argues, that, in order to realize the blessedness of which he has spoken, we must abstain from all evil, perform the duties of humanity, and exert ourselves in doing good to our neighbors. This doctrine is at variance with the dictates of corrupt human nature; but it is, notwithstanding, certain that many of the troubles and distresses in which the whole human race are involved, proceed from no other cause than this, that every man respectively, in his own sphere, being given to injustice, fraud, extortion, and evil-dealing, contemptuously rejects the blessing of God. Thus, it is in consequence of the barriers which men throw in their own way, that they do not attain happiness in this world, and that every man in his own place does not possess the peace and quietness which belong to him. It is then with the highest propriety that David passes from the doctrine of the preceding context to this exhortation: for if the meek possess the earth, then every one, as he regards his own happiness and peace, ought also to endeavor to walk uprightly, and to apply himself to works of beneficence. It should also be observed, that he connects these two things, first, that the faithful should strictly do good; and, secondly, that they should restrain themselves from doing evil: and this he does not without good reason: for as we have seen in the thirty-fourth psalm, it often happens that the same person who not only acts kindly towards certain persons, but even with a bountiful hand deals out largely of his own, is yet all the while plundering others, and amassing by extortion the resources by means of which he displays his liberality. Whoever, therefore, is desirous to have his good offices approved by God, let him endeavor to relieve his brethren who have need of his help, but let him not injure one in order to help another, or afflict and grieve one in order to make another glad. Now David, under these two expressions, has briefly comprised the duties of the second table of the law: first, that the godly should keep their hands free from all mischief, and give no occasion of complaint to any man; and, secondly, that they should not live to themselves, and to the promotion merely of their own private interests, but should endeavor to promote the common good of all according to their opportunities, and as far as they are able. But we have already said, that the blessing which is promised to the righteous, that "they shall inherit the earth," is not always realised in an equal degree as to all the people of God; and the reason we assigned for this is, that God cannot find among men an example of such great uprightness, but that even the most perfect procure to themselves much misery by their own fault: and therefore it need not surprise us though God withdraw, at least in some measure, his blessing even from his own. We know too to what excess the lusts of the flesh run riot, unless the Lord lay a restraint upon them. Besides, there is no one who is ready cheerfully to engage in meditation upon the divine life, who is not urged and encouraged to it by various motives. Hence it is that the possession of the earth, which David here assigns to the children of God, does not (as the lawyers would define the term) always consist in having the feet planted within it, and in being securely established in it; for there are many sources of disquietude and affliction here to trouble them. And yet it does not follow that it is a mere fiction or imaginary thing which he promises. For although daily experience shows us that the children of God do not as yet inherit the earth, yet, according to the measure of our faith, we feel how efficacious the blessing of God is, which, like a spring that cannot be drained, flows continually. They are indeed more than blind who do not perceive that the righteous have at present this reward, that God defends and upholds them by his power.

Depart from evil, and do good - This is the sum of all that is said in the psalm; the great lesson inculcated and enforced by all these references to the effects of good and evil conduct. All these results - all that people experience themselves, and all the effects of their conduct on their posterity, enforce the great practical lesson that we should do good and avoid evil. These results of conduct are among the means which God employs to induce men to do right, and to abstain from what is wrong.
And dwell for evermore - That is, dwell in the land: meaning (in accordance with the general drift of the psalm) that righteousness will be connected with length of days and with prosperity; that its effects will be permanent on a family, descending from one generation to another. See the notes at Psalm 37:3.

Depart from evil, and do good - Seeing the above is so, depart from all evil - avoid all sin; and let not this be sufficient, do good. The grace of God ever gives this two-fold power to all who receive it; strength to overcome evil, and strength to do that which is right.
Dwell for evermore - Be for ever an inhabitant of God's house. This may be also a promise of return to their own land, and of permanent residence there. See Psalm 37:9, Psalm 37:11, etc.

Depart from evil, and do good,.... Depart from evildoers, and their evil ways; join not with them, nor fret and be envious at them; but do acts of beneficence, and all good works; since righteous men, and their seed, are not forsaken, but blessed of God; See Gill on Psalm 34:14;
and dwell for evermore; or "thou shalt dwell for evermore" (z); see Psalm 37:3; that is, in everlasting habitations, in the house not made with hands, eternal in the heavens, Luke 16:9. The Targum is, "that thou mayest dwell in everlasting life".
(z) "et habitabis in seculum", Pagninus, Vatablus, Piscator; so Aben Ezra & Kimchi.

The exhortation is sustained by the assurance of God's essential rectitude in that providential government which provides perpetual blessings for the good, and perpetual misery for the wicked.

Dwell - Thou shalt dwell in the land, and afterwards in heaven.