So he drove out the man; and he placed at the east of the garden of Eden Cherubim, and a flaming sword which turned every way, to guard the way of the tree of life.
All Commentaries on Genesis 3:24 Go To Genesis 3
John Chrysostom
AD 407
Then, so that we may learn how great was the distance he moved him from the garden, Sacred Scripture teaches us this further fact in the words, "The Lord God drove Adam out and situated him opposite the garden of delight." [ Gen 3:24 ] Notice how each of the events proved an occasion of loving kindness on the part of the common Lord of all, and each example of punishment abounds with goodness. I mean, the expulsion was not the sole mark of love and goodness: there was also his location opposite the garden so that he might have unending anguish in recollecting from what heights he had fallen and cast himself into such depths. Yet even if the sight of it was the cause of unbearable pain, it was nevertheless an occasion of no little benefit: the constant sight proved to be an encouragement for this grieving man to carefulness in the future lest he fall into the same sin again. Such, after all, is the habit of human nature by and large: since, while we are in a position to enjoy good things, we don't know how to use them as we ought, we come to our senses with the loss of these things by learning through experience and gaining a sense of our own indifference. In this way we are taught by the change of fortunes from what heights we have fallen and with what troubles we have tortured ourselves. And so the instruction that the one who had lost his place there should dwell nearby and opposite the garden was a sign of deep concern in order that he might have the constant reminder from the sight of it and feel a sense of loss from it and never presume to eat from the tree through lusting after life while finding himself outside. Thus, you see, Sacred Scripture describes everything to us in a manner that shows considerateness for our limitations.
"He set the Cherubim and the flailing sword of fire to guard the approach to the tree of life." ' Their indifference which they had already demonstrated in regard to the command given them, proved the cause of the approach being barred against them with such precautions. Consider, I ask you, that the loving God was not content with their dwelling opposite the garden: he placed these powers, the Cherubim and the flailing sword of fire, to guard the way leading there. It was not without purpose that "flailing" was added: the reason was to teach us that every way was barred to him since that sword was turning around and blocking every way leading there, sufficient to provide him with a reminder and fill him with constant fear.