This verse opens the second movement of the interlude poem, Proverbs 3:13–20.
Quick answer
The wisdom just offered to the reader is the wisdom by which the LORD built the world.
Read the whole unit
Between the chapter's two lectures, it pauses to sing. This eight-verse interlude is a poem in two movements. The first (vv. 13–18) is framed by happiness: it opens "Happy is the man who finds wisdom" and closes "happy are all who retain her," and between those bookends it prices wisdom against everything an ancient reader valued, silver, gold, rubies, long life, riches, honor, and finds the market unable to match her. The closing image reaches all the way back to Eden: she is "a tree of life to those who take hold of her." The second movement (vv. 19–20) changes the register entirely: the same wisdom the son is urged to find is the wisdom by which the LORD founded the earth and established the heavens. That is the poem's quiet astonishment. The thing being offered to an ordinary young man is the very principle by which the world was made. Wisdom is not a study aid; she is woven into the architecture of reality, which is exactly why living against her is living against the grain of everything.
What this verse contributes
This verse explains why wisdom works: she is not a set of tips that happen to succeed but the principle by which reality was assembled. It deliberately reuses the poem's own vocabulary, wisdom and understanding, the very words of vv. 13–14, so the reader cannot miss it: what the LORD used to found the earth is what is being offered to you. Living wisely is living with the grain of the created order; living foolishly is dragging your life across it. Proverbs 8 will expand this into Wisdom's own account; here it is one architectural couplet.
Related: Proverbs 8:27–31 · Psalm 104:24
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.