John Trapp on Proverbs 14:8

Verſ. 8. The wiſdome of the prudent is to underſtand his way] His wiſdome begins in the right of himſelf, and ends in the right knowledge of God, that hee may walk worthy of God in all well-pleaſing, worthy of the calling wherewith hee is called, that high and heavenly calling, Heb. 2.1. to the fruition of high and heavenly priviledges, to an Angelical and convincing converſation, ſuch as may draw hearts, or daunt them. Wee uſe to ſay of him that knows his place, and carries himſelf accordingly, Such a man underſtands himſelf well enough: So here.

But the folly of fools is deceit] Or, is to underſtand deceit, to know the Devils depths, to ſearch his skull for carnal arguments that they may cum ratione inſanire, bee mad with ſhew of reaſon, and deceive the hearts of the ſimple. This their way is their folly; yet their poſterity (as wiſe as their fool-fathers) approve their ſayings, abbet their practices, Pſal. 49.13.