Proverbs 10:13 (BSB)

Wisdom is found on the lips of the discerning, but a rod is for the back of him who lacks judgment.

From Proverbs 10. Also in the ESV.

Commentary on Proverbs 10:13

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Proverbs 10:13: 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), Exposition of the Old and New Testaments on Proverbs 10:13: 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), Commentary Critical and Explanatory on the Whole Bible on Proverbs 10:13: In the lips . . . found--hence, not beaten, as the wicked-speaking fool. void of understanding-- (Pro 6:32; Pro 7:7).
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Proverbs 10:13: In the lips of him that hath understanding wisdom is found: but a rod [is] for the back of him that is void of understanding. (g) That is, God will find him out to punish him.