“A metaphysics of morals is therefore indispensably necessary, not merely because of a motive to speculation — for investigating the source of the practical basic principles that lie a priori in our reason — but also because morals themselves remain subject to all sorts of corruption as long as we are without that clue and supreme norm by which to appraise them correctly…”

—  Immanuel Kant

Groundwork of the Metaphysics of Morals (1785)

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German philosopher 1724–1804

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