Isaiah 42:23

l, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding. Two ways a man may show himself to be a wise man:—1. By the good temper, the sweetness and the sedateness, of his mind: A man of understanding is of an excellent spirit, a precious spirit (so the word is); he is one that looks well to his spirit, that it be as it should be, and so keeps it in an even frame, easy to himself and pleasant to others. A gracious spirit is a precious spirit, and renders a man amiable and more excellent than his neighbour. He is of a cool spirit (so some read it), not heated with passion, nor put into any tumult or disorder by the impetus of any corrupt affection, but even and stayed. A cool head with a warm heart is an admirable composition. 2. By the good government of his tongue. (1.) A wise man will be of few words, as being afraid of speaking amiss: He that has knowledge, and aims to do good with it, is careful, when he does speak to speak to the purpose, and says little in order that he may take time to deliberate. He spares his words, because they are better spared than ill-spent. (2.) This is generally taken for such a sure indication of wisdom that a fool may gain the reputation of being a wise man if he have but wit enough to hold his tongue, to hear, and see, and say little. If a fool hold his peace, men of candour will think him wise, because nothing appears to the contrary, and because it will be thought that he is making observations on what others say, and gaining experience, and is consulting with himself what he shall say, that he may speak pertinently. See how easy it is to gain men's good opinion and to impose upon them. But when a fool holds his peace God knows his heart, and the folly that is bound up there; thoughts are words to him, and therefore he cannot be deceived in his judgment of men. Wisdom and Folly.