The difference between knowledge and surrender (Matthew 8:14-34; Mark 4-5)

It is easy, sometimes, to confuse knowledge of Christ with surrender to Christ.  Some people know about Jesus, but they haven't surrendered their lives to Him.  A case in point is the situation of the demon-possessed man in the country of the Gerasenes.  When Jesus approaches the man, the demon speaks out: "What have you to do with me, Jesus, Son of the Most High God?"  The demon knew that Jesus was the Son of the Most High God, but his knowledge who Jesus is didn't cause him to surrender to Jesus in the sense of following Him.  Certainly the demon surrendered in the fact that he had no power over Jesus and, therefore, had to be made subject to Jesus' command, but there was no personal surrender of the will.  There are people still today who have knowledge of Jesus but have not yet surrendered to Him.  Are you in that category?  If so, what is the thing keeping you from surrendering?  If He is the "Son of the Most High God", as the demon called Him, wouldn't it be worth surrendering your will to His?