1 Kings and 2 Kings were composed by Jeremiah. This explains the close similarity of the books and their style and spirit. 2 Kings explains the waning years of the books of Judah. It provides insight of the Lord. 

Naaman was the commander of the Army of Syria, serving as one of the great leaders of King Benhadad II. Though a valiant soldier, Naaman had leprosy. By way of Elisha's prayer, Naaman was being prepared for a different mission. However, Naaman’s pride was hurt by the instructions he received to heal himself so, he decided to turn back from the mission, which was greater than he.

Sin and Satan will cause you to relapse; to turn back. But God always has a ram in the bush when he has purpose for your life. God will do whatever is necessary to accomplish His will. He will knock you on your behind, give you a terrible disease, like leprosy, take you through strange detoxing, intensify your pain, and even more.

There are many today of the same mindset as Naaman. But metaphorically, we must follow Elisha's instructions and wash ourselves in the old Jordan River. The healing does not come from the dirty water, but from God.