This verse sits inside the father's lecture on guarding the heart, Proverbs 4:20–27.
Quick answer
Keep the words where you can see them, and store them at the center: the heart's midst, where nothing arrives by accident.
Read the whole unit
The father's lecture on guarding the heart is a body in order. It begins at the ear (v. 20): give attention, incline the ear to a father's words. It moves to the eyes and the heart (v. 21): keep the words in sight and store them at the center. It pauses to state what the words are worth (v. 22): life to those who find them, health to all their flesh. Then it arrives at the summit of the chapter and one of the summits of the book (v. 23): keep your heart with all diligence, for out of it spring the issues of life. In Hebrew thought the heart is not the seat of sentiment but the control room of the whole person, where thinking, desiring, and deciding live, and the verse names it a wellspring: everything a life produces flows up from there. What follows is not a new subject but the same subject walking: the mouth (v. 24), deceit and perversity put far away; the eyes (v. 25), fixed straight ahead; the feet (vv. 26–27), their path pondered, their steps established, swerving neither right nor left. The order is the teaching. The lecture does not begin with behavior and hope it seeps inward; it begins at the center and works outward, because mouth, eyes, and feet are downstream organs. They carry whatever the spring sends them.
What this verse contributes
This verse moves the father's words along the route the whole lecture maps: ear, then eyes, then heart. "In the midst of your heart" is placement language, deliberate and interior, wisdom stored where the person actually runs from, not filed where it can be consulted. The verse repeats the watchfulness of 3:21 with a deeper address; there the words stayed before the eyes, here they are carried into the middle of the self. What verse 23 will command makes sense only after this verse: a guarded heart is worth guarding because of what has been placed inside it.
Related: Proverbs 3:21 · Psalm 119:11
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.