They encourage themselves in an evil matter; or, in an evil scheme—the plan of making David unpopular, and then raising the standard of open revolt against him (2 Samuel 15:1-12). They commune of laying snares privily.
The ungodly continually set traps for the righteous, who are so simple that they often fall into them. We do not know the exact proceedings of his enemies against David at the time, the narrative of 2 Samuel 15:1-37 being so brief; but it was probably by some trickery that David was induced to quit the stronghold of Jerusalem, and so yield the seat of government, and many other advantages, to his rival.
They say, Who shall see them? (comp. Psalms 10:11; Psalms 59:7; Psalms 94:7). It is an inveterate folly for men to imagine, either that God will not see their actions, or that he will pay no heed to them.
A spurious humility is brought into play in the latter case—How can it be supposed that God will note the doings of such worms as men?