Proverbs 18:15 New English Translation

¹⁵The discerning person^[a] acquires knowledge,
and the wise person^[b] seeks^[c] knowledge.

Proverbs 18:15 tn Heb “discerning mind.” The term לֵב (lev, “mind, heart”) is a synecdoche of part (= heart/mind) for the whole (= person); cf. TEV, NLT “intelligent people.” Placing “heart” and “ear” in parallel encompasses more of the process of acquiring knowledge. The ear listens for and to instruction, and the mind considers what is heard to acquire knowledge.
Proverbs 18:15 tn Heb “the ear of the wise.” The term “ear” is a synecdoche of part (= ear) for the whole (= person): “wise person.” sn The wise continually seek more knowledge. D. Kidner says, “Those who know most know best how little they know” (Proverbs [TOTC], 129).
Proverbs 18:15 sn This line features a mixed metaphor: The “ear” is pictured “seeking.” The wise person is listening for (on the lookout for) things worth listening to in the pursuit of knowledge.

New English Translation (NET)