Theophylact of Ohrid — as excerpted in the Catena Aurea on John 6:15-21

“When either men or devils try to terrify us, let us hear Christ saying, It is I, be not afraid, i. e. I am ever near you, God unchangeable, immoveable; let not any false fears destroy your faith in Me. Observe too our Lord did not come when the danger was beginning, but when it was ending. He suffers us to remain in the midst of dangers and tribulations, that we may be proved thereby, and flee for succour to Him Who is able to give us deliverance when we least expect it. When man’s understanding can no longer help him, then the Divine deliverance comes. If we are willing also to receive Christ into the ship, i. e. to live in our hearts, we shall find ourselves immediately in the place, where we wish to be, i. e. heaven.”