John Calvin on John 18:5-6

5. It is I. He replies mildly that he is the person whom they seek, and yet, as if they had been struck down by a violent tempest, or rather by a thunderbolt, he lays them prostrate on the ground. There was no want of power in him, therefore, to restrain their hands, if he had thought proper; but he wished to obey his Father, by whose decree he knew that he was called to die.

We may infer from this how dreadful and alarming to the wicked the voicc of Christ will be, when he shall ascend his throne to judge the world. At that time he stood as a lamb ready to be sacrificed; his majesty, so far as outward appearance was concerned, was utterly gone; and yet when he utters but a single word, his armed and courageous enemies fall down. And what was the word? He thunders no fearful excommunication against them, but only replies, It is I What then will be the result, when he shall come, not to be judged by a man, but to be the Judge of the living and the dead; not in that mean and despicable appearance but shining in heavenly glory, and accompanied by his angels? He intended, at that time, to give a proof of that efficacy which Isaiah ascribes to his voice. Among other glorious attributes of Christ, the Prophet relates that

he will strike the earth with the rod of his mouth, and will slay the wicked by the breath of his lips, (Isaiah 11:4.)

True, the fulfillment of this prophecy is declared by Paul to be delayed till the end of the world, (2 Thessalonians 2:8.) Yet we daily see the wicked, with all their rage and pride, struck down by the voice of Christ; and, when those men fell down who had come to bind Christ, there was exhibited a visible token of that alarm which wicked men feel within themselves, whether they will or not, when Christ speaks by his ministers. Besides, as this was in some measure accidental to the voice of Christ, to whom it peculiarly belongs to raise up men who were lying in a state of death, he will undoubtedly display toward us such power as to raise us even to heaven.

John 18:7-9

7. He therefore asked them again, Whom seek ye? And they said, Jesus of Nazareth. 8. Jesus answered, I told you that it is I: if therefore you seek me, allow these to go away. 9. That the word which he had spoken might be fulfilled, Of those whom thou gavest to me I have lost none.