Jesus walked this earth preaching and healing people, but his main target was always our heart and the forgiveness of sins. In that, he calls us to a higher standard than the law of the old covenant - he wants our hearts so he can liberate it from evil desires and produce in us a new heart, pleasing to him! He is more than just a sin forgiving healer, he is our Lord with a clear expectation on his followers.
“Again Jesus called the crowd to him and said, “Listen to me, everyone, and understand this. 15 Nothing outside a person can defile them by going into them. Rather, it is what comes out of a person that defiles them.”
“These acts and dispositions, Jesus affirms, are what defile a man and they have their source in a heart which is in open rebellion against God.”
William L. Lane; The Gospel of Mark