Quick answer
A message is only as good as the person carrying it. The verse is about the courier rather than the content.
Read both lines
In a world without reliable communication, an envoy was the message, and a messenger who twisted or dropped one could start a war. The verse notes that such a man lands in trouble himself, which is the usual shape of consequence in this book. The second line's word for what a faithful envoy brings is a healing word, the same term used at 12:18 of a wise tongue. That is a large claim for a delivery job, and it says something about how much of communal life depends on ordinary people accurately passing things along.
Related: Proverbs 12:18 · Proverbs 25:13 · Proverbs 10:26
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.