“So when they had rowed about three or four miles, they saw Jesus walking on the sea and drawing near the boat; and they were afraid”. Jn 6:19
For observe that Christ does not appear to those in the boat immediately on their setting sail, nor at the commencement of their dangers, but when they are many furlongs off from the land. For not when the condition which harasses us first begins, does the grace of Him who saves visit us, but when the fear is at its height, and the danger now shews itself mighty, and we are found, so to say, in the midst of the waves of afflictions: then unlooked for does Christ appear, and puts away our fear, and will free us from all danger, by His Ineffable Power changing the dread things into joy, as it were a calm.
St. Cyril of Alexandria, Commentary on John.