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)

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

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basic clue lie metaphysics necessary norm reason remain source speculation

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