Afterward Jesus findeth him in the TEMPLE and said unto him, Behold, thou art made whole: sin NO MORE, lest a worse thing come unto thee. – John 5:14
The man Jesus healed, not only got healed physically, but spiritually as well. After he got healed Jesus found him in the TEMPLE. Most likely, he was thanking God, confessing his sins and repenting.
I believe this verse also shows us CLEARLY that the man was sick for 38 years because of some sin or sins he had committed. Jesus proved this when HE told the man to sin NO MORE. All sin has consequences. However, this verse also shows that when we confess our sins, and TURN AWAY from them, we will obtain mercy and be healed.
REPENTANCE is the LEAST preached about topic in most churches today.