Casanova gives us the early bound for his memoirs.
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The history of my life must begin by the earliest circumstance which my memory can evoke; it will therefore commence when I had attained the age of eight years and four months. Before that time, if to think is to live be a true axiom, I did not live, I could only lay claim to a state of vegetation. The mind of a human being is formed only of comparisons made in order to examine analogies, and therefore cannot precede the existence of memory. The mnemonic organ was developed in my head only eight years and four months after my birth; it is then that my soul began to be susceptible of receiving impressions.
-- Casanova, The Memoirs
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The history of my life must begin by the earliest circumstance which my memory can evoke; it will therefore commence when I had attained the age of eight years and four months. Before that time, if to think is to live be a true axiom, I did not live, I could only lay claim to a state of vegetation. The mind of a human being is formed only of comparisons made in order to examine analogies, and therefore cannot precede the existence of memory. The mnemonic organ was developed in my head only eight years and four months after my birth; it is then that my soul began to be susceptible of receiving impressions.
-- Casanova, The Memoirs