On the next day, the multitude that stood on the other side of the sea saw that there was no other boat there, except the one in which his disciples had embarked, and that Jesus hadn't entered with his disciples into the boat, but his disciples had gone away alone.

 Jesus was well aware that some would not only reject his offer but would reject it with hostility. No man can accept him unless he is moved by the Spirit of God to do so but to the end of the day a man can resist that Spirit. Such a man is shut out not by God, but by himself. 