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The Gulag Archipelago, Vol. 1, Part 1, ch. 4 (1973) [tr. Whitney] - Solzhenitsen, Alexander | WIST Quotations
To do evil a human being must first of all believe that what he's doing is good, or else that it's a well-considered act in conformity with natural law. Fortunately, it is in the nature of the human being to seek a justification for his actions.