Naaman was a mighty Syrian captain but he was a leper. Happily through the advice of a little Israeli girl he visited Elisha the prophet.
Elisha told him to wash in Jordan seven times and he would be healed. Sadly Naaman was too proud to do this simple thing and went away angry.
Eventually his servants cooled him down and he humbly obeyed and was healed.
We all have the disease called, 'SIN'. God offers cleansing simply through faith in Christ. To refuse is madness. [Do read 2 Kings chapter 5].