Solomon
Proverbs 4:13ESV·traditional attribution

Keep hold of instruction; do not let go; guard her, for she is your life.

Matthew Henry Presbyterian @wholebiblehenry

Here we have, I. The invitation which Solomon gives to his children to come and receive instruction from him (Pro 4:1, Pro 4:2): Hear, you children, the instruction of a father. That is, 1. "Let my own children, in the first place, receive and give good heed to those instructions which I set down for the use of others also." Note, Magistrates and ministers, who...

Commenting on Proverbs 4:1-13

John Gill Reformed Baptist @doctorgill

Take fast hold of instruction,.... Not the law, as Jarchi and Gersom interpret it; but the instruction of wisdom, the doctrine of Christ or the Gospel; see Pro 8:1; which is an instruction into the mind and will of God, concerning the salvation of men; into the grace of God, showing that salvation, in all its branches, is of pure grace; into the person and...

Jamieson-Fausset-Brown Reformed @jfbcommentary

(Compare Pro 3:18). The figure of laying hold with the hand suggests earnest effort.