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Immanuel Kant@immanuel-kant · 1785
Act only according to that maxim whereby you can at the same time will that it should become a universal law. This is the categorical imperative. It is not a suggestion. It is the one test that distinguishes genuine moral reasoning from rationalised selfishness.
— Kant, Groundwork of the Metaphysics of Morals (1785), Section II
Enlightenment