Proverbs 14:3

3 In the mouth of the fool is a switch of pride; But the lips of the wise preserve them. The noun חטר (Aram. חוּטרא, Arab. khiṭr), which besides here occurs only at Isa 11:1, meaning properly a brandishing (from חטר = Arab. khatr, to brandish, to move up and down or hither and thither, whence âlkhṭtâr, the brandisher, poet. the spear), concretely, the young elastic twig, the switch, i.e., the slender flexible shoot. Luther translates, "fools speak tyrannically," which is the briefer rendering of his earlier translation, "in the mouth of the fool is the sceptre of pride;" but although the Targum uses חוטרא of the king's sceptre and also of the prince's staff, yet here for this the usual Hebr. שׁבט were to be expected. In view of Isa 11:1, the nearest idea is, that pride which has its roots in the heart of the fool, grows up to his mouth. But yet it is not thus explained why the representation of this proceeding from within stops with חטר cf. Pro 11:30). The βακτηρία ὕβρεως (lxx, and similarly the other Greek versions) is either meant as the rod of correction of his own pride (as e.g., Abulwald, and, among the moderns, Bertheau and Zckler) or as chastisement for others (Syr., Targum: the staff of reviling). Hitzig is in favour of the former idea, and thinks himself warranted in translating: a rod for his back; but while גּוה is found for גּאוה, we do not (cf. under Job 41:7 : a pride are the, etc.) find גאוה for גוה, the body, or גּו, the back. But in general it is to be assumed, that if the poet had meant חטר as the means of correction, he would have written גּאותו. Rightly Fleischer: "The tongue is often compared to a staff, a sword, etc., in so far as their effects are ascribed to it; we have here the figure which in Rev 1:16 passes over into plastic reality." S…

See here, 1. A proud fool exposing himself. Where there is pride in the heart, and no wisdom in the head to suppress it, it commonly shows itself in the words: In the mouth there is pride, proud boasting, proud censuring, proud scorning, proud commanding and giving law; this is the rod, or branch, of pride; the word is used only here and Isa 11:1. It grows from that root of bitterness which is in the heart; it is a rod from that stem. The root must be plucked up, or we cannot conquer this branch, or it is meant of a smiting beating rod, a rod of pride which strikes others. The proud man with his tongue lays about him and deals blows at pleasure, but it will in the end be a rod to himself; the proud man shall come under an ignominious correction by the words of his own mouth, not cut as a soldier, but caned as a servant; and herein he will be beaten with his own rod, Psa 64:8. 2. A humble wise man saving himself and consulting his own good: The lips of the wise shall preserve them from doing that mischief to others which proud men do with their tongues, and from bringing that mischief on themselves which haughty scorners are often involved in.

14:3 A fool’s word can be used against him.