“When I say to Ubertino that human nature itself, in the complexity of its operations, governs both the love of good and the love of evil, I am trying to convince Ubertino of the identity of human nature. When I say to the abbot, however, that there is a difference between a Catharist and a Waldensian, I am insisting on the variety of their accidents. And I insist on it because a Waldensian may be burned after the accidents of a Catharist have been attributed to him, and vice versa. And when you burn a man you burn his individual substance and reduce to pure nothing that which was a concrete
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