When therefore they had rowed about twenty-five or thirty stadia,{25 to 30 stadia is about 5 to 6 kilometers or about 3 to 4 miles} they saw Jesus walking on the sea, and drawing near to the boat; and they were afraid.

 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. 