The story of Elisha and Naaman is fascinating. Elisha became the prophet after the ascension of Elijah. He took up his mantle, and in every way was a prophet. He did miracles similar to many of Elijah. He stopped the Jordan River and blessed a widow (but in a bit different way.)
Naaman was a Syrian centurion. A great man in battle, he also had leprosy. A young Jewish woman, his servant who had been taken prisoner, remembered to tell him about the prophet who could heal him. And so arrangements were made for him to visit Elisha. But Elisha did not come out to him, but sent a servant with the message, wash in the River Jordan Ten Times. The prophet asked for exacting obedience. Naaman was able to humble himself, and give this obedience.
Went to missionary farewell talk of Maddy Banks. She talked of this in her talk today. She said that in serving a mission, her goal is to be exactly obedient. That going on a mission would not be worthwhile without exacting obedience.
That is what President Monson says in this short conference excerpt. Blessing come from obedience.