Blessing in (heavy) Disguise

Thought provoking post by Michael Hyatt 'Does God Send Negative People Into our Lives?'

a snippet:
It’s easy to resent negative people. But what if God has a deep and important purpose for sending them—something that He intends for our good because He truly loves us.

Question: What possibility is present when you encounter negative or difficult people that is not present at other times?

The comments on the post are well worth a read too.