An idea from Groundwork of the Metaphysics of Morals

The universal-law test, the respect-for-persons rule and the law-making rule are offered as 3 ways of stating one law. Many readers doubt they are really the same. The respect-for-persons version often settles cases the universal-law test can’t.

From Groundwork of the Metaphysics of Morals by Immanuel Kant

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