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.

 Here we come upon a truth that re-emerges in every age. Time and again it is not the intellectual difficulty which keeps men from becoming Christians; it is the height of Christ's moral demand. At the heart of an religion there must be mystery, for the simple reason that at that heart there is God. In the nature of things man cannot ever fully understand God. Any honest thinker will accept that there must be mystery. 