By asking Naaman for money and clothing, he destroyed the message that Elisha had given. Elisha looked at this compromise as very serious, deserving severe consequences. SO SHOULD WE!!
The second lesson in this account is the hideous nature of cover-up and lying about what Gehazi did to gain personal benefit (money and clothing). Such actions proved that Gehazi could no longer be trusted with the ministry he had. He was immediately exposed and given the physical effects of his sin, leprosy. The root of this failure was in his heart and that became exposed for all to see in this outward manifestation. The warning cannot be clearer. If we try to handle the work of God with duplicitous motives, God will both remove us from His work and place on us a reminder of how serious our failure is. This was a heart issue.
Honoring God begins in the heart! All of us must examine our motives and unsparingly judge those that violate the character of God.