Jesus healed many people but quite often He would tell them not to tell anyone. Why? Because the message of healing would divert people from the true message. First, we should come to God not for what we can get from Him but for who He is. Second, the main message of Christ is "Repent for the kingdom of heaven is near."
Even though the man was physically healed, he still needed to be spiritually healed. Don't let the message of healing divert you from the main message of repentance and turning to God.