I was going along thinking, and he said, “Thou thinkest perhaps on this ruin which is guarded by that bestial with which I just now quenched. Now would I have thee know that the other time when I descended hither into the nether hell, this cliff had not yet fallen. But in truth, if I discern clearly, a little ere He came, who levied the great spoil on Dis from the supernal circle, in all its parts the deep foul valley trembled so that I thought the universe had felt the love by which, as some believe, oft times the world has been converted into chaos:[1] and, at that moment, this ancient cliff here and elsewhere made this downfall. But fix thine eyes below, for the river of blood is near, in which boils whoso doth harm to others by violence.” [1] Empedocles taught, as Dante may have learned from Aristotle, that Love and Hate were the forces by which the elements of which the world is composed were united and dissociated. The effort of Love was to draw all things into a simple perfect sphere, by which the common order of the world would be brought to chaos. Oh blind cupidity, both guilty and mad, that so spurs us in the brief life, and then, in the eternal, steeps us so ill! I saw a broad ditch, bent in an arc, like one that embraces all the plain; according as my Guide had said. And between the foot of the bank and it, in a file were running Centaurs armed with arrows, as they were wont in the world to go to the chase. Seeing us descending, all stopped, and from the troop three detached themselves, with bows and arrows first selected. And one shouted from afar, “To what torment are ye coming, ye who descend the slope? Tell it from there; if not, I draw the bow.” My Master said, “We will make answer unto Chiron near you there: ill was it that thy will was ever thus hasty.” Then he touched me, and said, “That is Nessus, who died for the beautiful Dejanira, and he himself wrought vengeance for himself; and that one in the middle, who is gazing on his breast, is the great Chiron who nurtured Achilles. That other is Pholus, who was so full of wrath. Round about the ditch they go by thousands shooting with their arrows what soul lifts itself from the blood more than its guilt has allotted it.”