[49] for how could it be said that he who had suffered no mutilation whatever, namely Theon, was taken off, and that Dion, who had lost a foot, was not injured? Very appropriately, he will reply, for Dion, who had had his foot cut off, falls back upon the original imperfection of Theon, and there cannot be two specific differences in the same subject, therefore it follows of necessity that Dion must remain, and that Theon must be taken off— / "So are we slain by arrows winged With our own feathers," [21] as the tragic poet says. For any one, copying the form of this argument and adapting it to the entire world, may prove in the clearest manner that providence itself is liable to corruption.