As for the extreme fixity of this regimen, this did not develop until the philosopher reached his fortieth birthday, and then it was an expression of his unique views on human character. Character, for Kant, is a rationally chosen way of organizing one’s life, based on years of varied experience—indeed, he believed that one does not really develop a character until age forty. And at the core of one’s character, he thought, were maxims—a handful of essential rules for living that, once formulated, should be followed for the rest of one’s life. Alas, we do not have a written list of Kant’s
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