Cease from anger - That is, in reference to the fact that there are wicked people, and that they are permitted to carry out their plans. Do not allow your mind to be excited with envious, fretful, wrathful, or murmuring feelings against God because he bears patiently with them, and because they are allowed a temporary prosperity and triumph. Be calm, whatever may be the wickedness of the world. The supreme direction belongs to God, and he will dispose of it in the best way.
And forsake wrath - That is, as above, in regard to the existence of evil, and to the conduct of wicked men.
Fret not thyself in any wise - See Psalm 37:1. Let the mind be entirely calm and composed.
To do evil - So as to lead you to do evil. Do not allow your mind to become so excited that you will indulge in harsh or malignant remarks; or so as to lead you to do wrong to any man, however wicked he may be. See always that you are right, whatever others may be, and do not allow their conduct to be the means of leading you into sin in any form. Look to your own character and conduct first.

Cease from anger, and forsake wrath: (g) fret not thyself in any wise to do evil.
(g) Meaning, unless he moderates his affection, he will be led to do as they do.

Cease from anger,.... Either at these wicked men who are so prosperous, or at God, who for the present suffers it; see Jonah 4:9, Proverbs 19:3;
and forsake wrath; which is anger wrought up to a greater degree; and the rather to be shunned and avoided, as being very disagreeable to the character of a good man;
fret not thyself in any wise to do evil; evil may be done by fretting at the prosperity of wicked men, or by imitating them, doing as they do, in hope of being prosperous as they are; from which the psalmist dissuades by reasons following.

On הרף (let alone), imper. apoc. Hiph., instead of הרפּה, vid., Ges. ֗75, rem. 15. אך להרע is a clause to itself (cf. Proverbs 11:24; Psalm 21:5; Psalm 22:16): it tends only to evil-doing, it ends only in thy involving thyself in sin. The final issue, without any need that thou shouldst turn sullen, is that the מרעים, like to whom thou dost make thyself by such passionate murmuring and displeasure, will be cut off, and they who, turning from the troublous present, make Jahve the ground and aim of their hope, shall inherit the land (vid., Psalm 25:13). It is the end, the final and consequently eternal end, that decides the matter.

Fret not - Either against the sinner for his success; or against God. Do evil - If grief arise in thee, take care that it do not transport thee to sin.