
Here is Voltaire at eight or nine, and we can perhaps already see the spirit of the man. Did I really say Voltaire? Of course, I mean Casanova, who seems to be an interesting thinker, but is no Voltaire. I imagine there is a reason why Voltaire is famous for his wit while Casanova is more reputed for his penis.
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One day, about the middle of November, I was with my brother Francois, two years younger than I, in my father’s room, watching him attentively as he was working at optics. A large lump of crystal, round and cut into facets, attracted my attention. I took it up, and having brought it near my eyes I was delighted to see that it multiplied objects. The wish to possess myself of it at once got hold of me, and seeing myself unobserved I took my opportunity and hid it in my pocket.
A few minutes after this my father looked about for his crystal, and unable to find it, he concluded that one of us must have taken it. My brother asserted that he had not touched it, and I, although guilty, said the same; but my father, satisfied that he could not be mistaken, threatened to search us and to thrash the one who had told him a story. I pretended to look for the crystal in every corner of the room, and, watching my opportunity I slyly slipped it in the pocket of my brother’s jacket.
At first I was sorry for what I had done, for I might as well have feigned to find the crystal somewhere about the room; but the evil deed was past recall. My father, seeing that we were looking in vain, lost patience, searched us, found the unlucky ball of crystal in the pocket of the innocent boy, and inflicted upon him the promised thrashing. Three or four years later I was foolish enough to boast before my brother of the trick I had then played on him; he never forgave me, and has never failed to take his revenge whenever the opportunity offered.
-- Casanova, The Memoirs
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One suspects that the little brother did not suffer a lack of causes to continue the grudge.