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In Rome, I had nearly five thousand volumes in my library. By reading and re-reading them, I discovered that one hundred and fifty books, carefully chosen, give you, if not a complete summary of human knowledge, at least everything that it is useful for a man to know. I devoted three years of my life to reading and re-reading these hundred and fifty volumes, so that when I was arrested I knew them more or less by heart. In prison, with a slight effort of memory, I recalled them entirely. So I can recite to you Thucydides, Xenophon, Plutarch, Livy, Tacitus, Strada, Jornadès, Dante, Montaigne, Shakespeare,
Spinoza, Machiavelli and Bossuet; I mention only the most important …’
I have to admit that my historical work is my favourite occupation. When I go back to the past, I forget the present. I walk free and independently through history, and forget that I am a prisoner.
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