See here, 1. The good conduct of a wise and good man; he manages himself well. it is not the wisdom of the learned, which consists only in speculation, that is here recommended, but the wisdom of the prudent, which is practical, and is of use to direct our counsels and actions. Christian prudence consists in a right understanding of our way; for we are travellers, whose concern it is, not to spy wonders, but to get forward towards their journey's end. It is to understand our own way, not to be critics and busybodies in other men's matters, but to look well to ourselves and ponder the path of our feet, to understand the directions of our way, that we may observe them, the dangers of our way, that we may avoid them, the difficulties of our way, that we may break through them, and the advantages of our way, that we may improve them - to understand the rules we are to walk by and the ends we are to walk towards, and walk accordingly. 2. The bad conduct of a bad man; he puts a cheat upon himself. He does not rightly understand his way; he thinks he does, and so misses his way, and goes on in his mistake: The folly of fools is deceit; it cheats them into their own ruin. The folly of him that built on the sand was deceit.

The wisdom of the prudent is to understand his way,.... The way of his calling, in which he should abide, and how to manage it in the best manner; the way of his duty, that he may walk inoffensively both towards God and men; and the way of life and salvation, which is by Jesus Christ, which to understand and to walk in is the highest wisdom and prudence;

but the folly of fools is deceit: or "the wisdom of fools", which the opposition requires, and is meant, and is what the Holy Ghost calls "folly", as elsewhere, Co1 3:19; this is itself "deceit"; it is science, falsely so called; it lies in tricking and deceiving; and the issue of it is, not only the deceiving of others, but themselves also: such is the folly of the man of sin and followers, which lies in deceiving the inhabitants of the earth with their sorceries and superstitions, with their lying wonders and miracles; see Th2 2:10, Rev 13:14.

Appearances deceive the thoughtless, but the prudent discriminate.