Charles H. Spurgeon on Psalms 36:4

He setteth himself in a way that is not good. To wait to sin is to sin deliberately, yea, to wait to sin resolvedly. That sin is exceedingly sinfully committed which we set and prepare ourselves to commit. David, describing a wicked man, saith, He setteth himself in a way that is not good; that is, in an evil way: he doth not only fall into sin (that may be the case of a good man), but he takes or chooseth an evil way, and then sets or settles himself in it, resolving not to leave it, no, nor to be beaten out of it. Sin may be said to wait for a godly man, that is, Satan waits and watches his season to tempt him unto sin; but a godly man doth not wait nor watch to sin. It is bad enough to be overtaken with sin, or with a fault (as the apostle speaks, Ga 6:1); but to be taken with sin, and so to wait for a season to take our fill of it, is as bad as bad can be. Joseph Caryl.