John Chrysostom
Do you see the unconquerable power, how He, while standing among them, blinded their eyes?
That darkness was not the cause is shown by the Evangelist, who said that they had lamps.
Even if there had been no lamps, they still ought to have recognized Him by His voice.
If they did not know Him, how could Judas fail to know Him, since he had been inseparably with Him?
For he too was standing with them. Yet he not only failed to recognize Him, like the others, but was also thrown to the ground with them.
Jesus did this to show that without His consent they could not only not take Him, but not even see Him, though He stood among them.
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Notice the Evangelist's lack of malice. He does not revile the betrayer, but narrates the event, striving only to show that everything happened by His consent.
Such was Judas' powerlessness to betray Him. He could not even see the One whom he intended to betray, although He was there, with lamps and such abundance of light.
The Evangelist hinted at this when he said that they had lamps and torches, and still could not find Him.
This is clear from the words, "Judas also stood with them," the one who had said, "I will deliver Him to you."
The Lord blinded their mind, wishing to show His own power and to make them realize that they were attempting an impossible thing.
Then, hearing His voice, they drew back and fell to the ground.
Do you see how they could not even endure His voice, and by falling face down plainly displayed their powerlessness?