The prophets of old spoke God's message; they also lived God's message. Hosea's personal familial relationships became a metaphor for God's relationship with God's people.
The prophet Elisha offers the means by which Naaman, commander of the Aram army, can be healed of leprosy. But that isn't the power that drives this account. It is the power offered through faith and witness and service that leads Naaman to healing.