Quick answer
A good judge does not have to say anything. The verse describes evil dispersing under a look.
Read both lines
The verb is agricultural, the same word used for winnowing, and it reappears at verse 26 when the king sifts the wicked. So the image is grain thrown into the air, with the useless part carried off by the wind, and applying it to a courtroom says something specific: the work is separation rather than destruction. What makes the line vivid is that the instrument is his eyes. This is a portrait of a court functioning as it should, where attention itself is a deterrent, and it belongs to the run of royal verses this chapter keeps returning to. The verse is describing an ideal rather than reporting on any particular king, and the book is candid elsewhere about the other kind. What it establishes here is the standard the later verses measure against.
Related: Proverbs 20:26 · Proverbs 20:28 · Proverbs 16:12 · Proverbs 29:14
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.