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.

In the mouth of the foolish is a rod of pride,.... A proud tongue, or a tongue speaking proud and haughty things; with which foolish or wicked men smite others and wound and hurt their reputation and credit, and in the issue hurt themselves also; their tongue is not only a rod to others, but a scourge to themselves, or is the cause of evil coming upon them; such was the tongue of Pharaoh, as Jarchi on the place observes, Exo 5:2; and of those the psalmist speaks of, Psa 73:9; and particularly of antichrist, whose mouth is opened in blasphemies against God, and his tabernacle, and his saints, Rev 13:5;

but the lips of the wise shall preserve them; from speaking such proud and haughty things against God and men; or from being hurt by the tongues of men or their own; yea, what coaxes out of their mouth is confounding and destructive to their enemies, Rev 11:5.

rod of pride--that is, the punishment of pride, which they evince by their words. The words of the wise procure good to them.