Приповісті 10:13

There follow now two other proverbs on the use and abuse of speech: On the lips of the man of understanding wisdom is found; And the rod for the back of the fool. With Lwenstein, Hitzig, and others, it is inadmissible to regard ושׁבט as a second subject to תּמּצא. The mouth itself, or the word of the mouth, may be called a rod, viz., a rod of correction (Isa 11:4); but that wisdom and such a rod are found on the lips of the wise would be a combination and a figure in bad taste. Thus 13b is a clause by itself, as Luther renders it: "but a rod belongs to the fool's back;" and this will express a contrast to 13a, that while wisdom is to be sought for on the lips of the man of understanding (cf. Mal 2:7), a man devoid of understanding, on the contrary, gives himself to such hollow and corrupt talk, that in order to educate him to something better, if possible, the rod must be applied to his back; for, according to the Talmudic proverb: that which a wise man gains by a hint, a fool only obtains by a club. The rod is called שׁבט, from שׁבט, to be smooth, to go straight down (as the hair of the head); and the back גּו, from גּוה, to be rounded, i.e., concave or convex.

Observe, 1. Wisdom and grace are the honour of good men: He that has understanding, that good understanding which those have that do the commandments, wisdom is found in his lips, that is, it is discovered to be there, and consequently that he has within a good treasure of it, and it is derived thence for the benefit of others. It is a man's honour to have wisdom, but much more to be instrumental to make others wise. 2. Folly and sin are the shame of bad men: A rod is for the back of him that is void of understanding - of him that wants a heart; he exposes himself to the lashes of his own conscience, to the scourges of the tongue, to the censures of the magistrate, and to the righteous judgments of God. Those that foolishly and wilfully go on in wicked ways are preparing rods for themselves, the marks of which will be their perpetual disgrace.

10:13 beaten with a rod: People lacking sense will bring harm upon themselves through what they say. Concerning physical discipline, see 23:13-14.