Solomon
Proverbs 10:13ESV·traditional attribution

On the lips of him who has understanding, wisdom is found, but a rod is for the back of him who lacks sense.

Matthew Henry Presbyterian @wholebiblehenry

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.

John Gill Reformed Baptist @doctorgill

In the lips of him that hath understanding wisdom is found,.... He that has an understanding, especially of divine, spiritual, and evangelic things, which is the pure gift of God; wisdom will be found in his lips, his mouth will speak of it; not of mere natural wisdom, but spiritual wisdom; of the wisdom of God in his works; of Christ, the Wisdom of God...

Jamieson-Fausset-Brown Reformed @jfbcommentary

In the lips . . . found--hence, not beaten, as the wicked-speaking fool. void of understanding-- (Pro 6:32; Pro 7:7).