| Matthew Henry's Concise Commentary 6:15-21 Here were Christ's disciples in the way of duty, and Christ was praying for them; yet they were in distress. There may be perils and afflictions of this present time, where there is an interest in Christ. Clouds and darkness often surround the children of the light and of the day. They see Jesus walking on the sea. Even the approaches of comfort and deliverance often are so mistaken, as to become the occasions of fear. Nothing is more powerful to convince sinners than that word, I am Jesus whom thou persecutest; nothing more powerful to comfort saints than this, I am Jesus whom thou lovest. If we have received Christ Jesus the Lord, though the night be dark, and the wind high, yet we may comfort ourselves, we shall be at the shore before long.
Pulpit CommentaryVerse 20. - But he saith to them, It is I (literally, I am); be not afraid. These Divine words, in a voice which reminded them of his entire personality, of all his previous beneficence, of all his knowledge of their weakness and fear, are sacredly symbolic. The Church has ever since regarded them as veritably sacramental. In the darkest hour of men and Churches, in the throes of persecution in the furnace of temptation, on a million death-beds, the same voice has been heard. tits Divine Personality, his infinite power and perfect sympathy, the conviction of his specialized regard and veritable nearness (as we count nearness), have scattered doubt and fear.
Gill's Exposition of the Entire BibleBut he saith to them, it is I, be not afraid. See Gill on Matthew 14:27.
Jamieson-Fausset-Brown Bible Commentary20. It is I; be not afraid—Matthew (Mt 14:27) and Mark (Mr 6:50) give before these exhilarating words, that to them well-known one, "Be of good cheer!"
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