It is I: be not terrified We learn from them that it is in Christ's presence alone that we have abundant grounds of confidence, so as to be calm and at ease. But this belongs exclusively to the disciples of Christ; for we shall afterwards see that wicked men were struck down by the same words, It is I, (John 18:6.) The reason of the distinction is, that he is sent as a Judge to the reprobate and unbelievers for their destruction; and, therefore, they cannot bear his presence without being immediately overwhelmed. But believers, who know that he is given to them to make propitiation, as soon as they hear his name, which is a sure pledge to them both of the love of God and of their salvation, take courage as if they had been raised from death to life, calmly look at the clear sky, dwell quietly on earth, and, victorious over every calamity, take him for their shield against all dangers. Nor does he only comfort and encourage them by his word, but actually removes also the cause of the terror by allaying the tempest.

But he saith to them, it is I, be not afraid. See Gill on Matthew 14:27.

It is I; be not afraid--Matthew (Matthew 14:27) and Mark (Mark 6:50) give before these exhilarating words, that to them well-known one, "Be of good cheer!"