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.

 Andrew did not know what he was doing when he brought that lad to Jesus that day, but he was providing material for a miracle. We never know what possibilities we are releasing when we bring someone to Jesus. 