In the fourth watch of the night. — The Jews, since their conquest by Pompeius, had adopted the Roman division of the night into four watches, and this was accordingly between 3 A.M. and 6 A.M., in the dimness of the early dawn. St. John adds, as from a personal reminiscence, and as guarding against explanations that would minimise the miracle (such as that our Lord was seen on the shore, or was swimming to the boat), that they were about twenty-five or thirty furlongs from the point from which they had started — i.e., as the lake was five miles wide, nearly three-fourths of the way across.
Walking on the sea. — Here, again, we have to choose between the simple acceptance of the supernatural fact as another instance of His sovereignty, or rejecting it as a legend. On the former supposition. we may see in it something like an anticipation (not unconnected, it may be, with the intensity of that crisis in His life) of that spiritual body of which we see another manifestation in the Transfiguration, and which became normal after the Resurrection, reaching its completeness in the wonder of the Ascension. We speculate almost involuntarily on the nature, and, as it were, process of the miracle, asking whether the ordinary laws that govern motion were broken or suspended, or counteracted by higher laws. No such questions would seem to have suggested themselves to the disciples. They, as yet not free from the popular superstitions of their countrymen, thought that it was “a spirit” (better, a phantom, or spectre) taking the familiar form, it might be, to lure them to their destruction, or as a token that some sudden mischance had deprived them of that loved Presence, and, therefore, in their vague terror, they were troubled, and cried out for fear.