He deviseth mischief upon his bed - Margin, as in Hebrew: "vanity." That is, when he lies down; when he is wakeful at night; he plots some scheme of iniquity - some vain, wicked enterprise. So in Proverbs 4:16, "For they sleep not, except they have done mischief; and their sleep is taken away, unless they cause some to fall."

He setteth himself - That is, he takes his stand or his position; he assumes this attitude. See Psalm 2:2, "The kings of the earth "set themselves,"" where the same word occurs. The meaning is that what is done by him is the result of a calm and deliberate purpose. It is not the effect of passion or temporary excitement, but it is a deliberate act in which the mind is made up to do the thing. The conduct here referred to is thus distinguished from rash and hasty acts, showing that this is the settled character of the man.

In a way that is not good - In a bad or wicked way; in a way in which no good can be found; in conduct which allows of no redeeming or mitigating circumstances, and for which there can be no apology.

He abhorreth not evil - He has no aversion to evil. He is not in any manner deterred from doing anything because it is wrong. The fact that it is sinful is not allowed to be a consideration affecting his mind in determining what he shall do. In other words, the moral quality of an action does not influence him at all in making up his mind as to how he shall act. If it is right, it is by accident, and not because he prefers the right; if it is wrong, that fact does not in any way hinder him from carrying his purpose into execution. This is, of course, the very essence of depravity.

He deviseth mischief upon his bed - He seeks the silent and undisturbed watches of the night, in order to fix his plans of wickedness.

He setteth himself - Having laid his plans he fixes his purpose to do what is bad; and he does it without any checks of conscience or abhorrence of evil. He is bent only on mischief, and lost to all sense of God and goodness. A finished character of a perfect sinner.

He deviseth mischief upon his bed,.... He casts about in his mind on his pillow, when at leisure from all employment; and consults and contrives schemes how to compass his lusts, and to do injury to others, without doing which he cannot sleep;

he setteth himself in a way that is not good, in an evil way, which he chooses and delights in, and determines to continue in, he leaving the paths of righteousness to walk in the ways of darkness:

he abhorreth not evil; which is to be abhorred both because of its nature and effects; see Romans 12:9; but on the contrary he loves it, takes pleasure in doing it, and in them that commit it: thus, by his thoughts, words, and actions, he appears to be devoid of the fear of God.

He {d} deviseth mischief upon his bed; he setteth himself in a way that is not good; he abhorreth not evil.

(d) By describing at large the nature of the reprobate, he admonishes the godly to beware of these vices.

36:4 Deviseth - Freely, from his own inclination, when none are present to provoke him to it.

mischief: or, vanity

36:1-4 From this psalm our hearts should be duly affected with hatred of sin, and seek satisfaction in God's loving-kindness. Here is the root of bitterness, from which all the wickedness of wicked men comes. It takes rise from contempt of God, and the want of due regard to him. Also from the deceit they put upon their own souls. Let us daily beg of God to preserve us from self-flattery. Sin is very hurtful to the sinner himself, and therefore ought to be hateful; but it is not so. It is no marvel, if those that deceive themselves, seek to deceive all mankind; to whom will they be true, who are false to their own souls? It is bad to do mischief, but worse to devise it, to do it with plot and management. If we willingly banish holy meditations in our solitary hours, Satan will soon occupy our minds with sinful imaginations. Hardened sinners stand to what they have done, as though they could justify it before God himself.