Solomon
Proverbs 15:31ESV·traditional attribution

The ear that listens to life-giving reproof will dwell among the wise.

Matthew Henry Presbyterian @wholebiblehenry

Note, 1. It is the character of a wise man that he is very willing to be reproved, and therefore chooses to converse with those that, both by their words and example, will show him what is amiss in him: The ear that can take the reproof will love the reprover.

John Gill Reformed Baptist @doctorgill

The ear that heareth the reproof of life,.... That is given according to the word of life, in a warm, fervent, and lively manner, with zeal, and in good earnest; which reproves the life of another by his own, as well as by words; and which tends to the spiritual and eternal life of the person reproved; being taken, a man that diligently hearkens to...

Jamieson-Fausset-Brown Reformed @jfbcommentary

(Compare Pro 10:17). reproof of life--which leads to life. abideth . . . wise--is numbered among them.