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.
Walking on the sea is not something Jesus did just to amaze the disciples, but rather it is a powerful, visible demonstration of Jesus’ sovereignty over the world that he created (Hebrews 1:3, Hebrews 1:10). In the OT, God alone rules over the seas (Psalms 29:10-11; Psalms 89:9; Psalms 107:28-30).