Proverbs 16:20

Note, 1. Prudence gains men respect and success: He that handles a matter wisely (that is master of his trade and makes it to appear he understands what he undertakes, that is considerate in his affairs, and, when he speaks or writes on any subject, does it pertinently) shall find good, shall come into good repute, and perhaps may make a good hand of it. 2. But it is piety only that will secure men's true happiness: Those that handle a matter wisely, if they are proud and lean to their own understanding, though they may find some good, yet they will have no great satisfaction in it; but he that trusts in the Lord, and not in his own wisdom, happy is he, and shall speed better at last. Some read the former part of the verse so as to expound it of piety, which is indeed true wisdom: He that attends to the word (the word of God, Pro 13:13) shall find good in it and good by it. And whoso trusts in the Lord, in his word which he attends to, is happy.

— Matthew Henry's Concise Commentary (public domain)

handleth a matter--wisely considers "the word," that is, of God (compare Pro 13:13). trusteth--(Compare Psa 2:12; Psa 118:8-9).

— Jamieson-Fausset-Brown Commentary (public domain)