Keil & Delitzsch, on Prov 23:12

“Let thy heart apply itself to instruction: and thy ears to words of knowledge.”

“The following proverb warrants us to pause here, for it opens up, as a compendious echo of Pro 22:17-21, a new series of proverbs of wisdom: 12 Apply thine heart to instruction, And thine ear to the utterances of knowledge. We may, according as we accent in למּוּסר the divine origin or the human medium, translate, offer disciplinae (Schultens), or adhibe ad disciplinam cor tuum (Fleischer). This general admonition is directed to old and young, to those who are to be educated as well as to those who are educated. First to the educator:”

Imported from an open dataset — not yet checked against the printed edition.