For Diderot and Hume the relevant features of human nature are characteristics of the passions; for Kant the relevant feature of human nature is the universal and categorical character of certain rules of reason. (Kant of course denies that morality is ‘based on human nature’, but what he means by ‘human nature’ is merely the physiological non-rational side of man.) Kierkegaard no longer attempts to justify morality at all; but his account has precisely the same structure as that which is shared by the accounts of Kant, Hume and Diderot, except that where they appeal to characteristics of the
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