Quick answer
One man wants what someone else caught. The other grows something. The verse contrasts appetite with production.
Read both lines
The first line describes wanting the take, the haul somebody else brought in, which makes the wicked a spectator to his own ambition. The second returns to the root image from verse 3, and adds what a root eventually does: it yields. Between the two lines sits the whole difference this chapter keeps drawing, between a life oriented toward acquiring and a life oriented toward producing. Note that the root was called immovable in verse 3 and fruitful here, so the same unglamorous underground thing is both the stability and the harvest.
Related: Proverbs 12:3 · Proverbs 11:30 · Proverbs 12:14
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.