For they all saw him, and were troubled
 Had it been only seen by one, it might have been thought a fancy, and the effect of mere imagination; but as every one saw it, it was out of all doubt that so it was, and which gave them the greater concern: 
 and immediately he talked with them;
 as soon as they saw him, "that very moment", as the Syriac renders it; that so by hearing his voice their fears might be allayed: 
 and saith unto them, be of good cheer, it is I, be not afraid;
 (See Gill on Matthew 14:27).