"I might...say that to all those à priori moralists who deem it necessary to argue at all, utilitarian arguments are indispensable...I cannot help referring, for illustration, to a systematic treatise by one of the most illustrious of them, the Metaphysics of Ethics, by Kant. This remarkable man, whose system of thought will long remain one of the landmarks in the history of philosophical speculation, does, in the treatise in question, lay down an universal first principle as the origin and ground of moral obligation; it is this:—'So act, that the rule on which thou actest would admit of being adopted as a law by all rational beings.' But when he begins to deduce from this precept any of the actual duties of morality, he fails, almost grotesquely, to show that there would be any contradiction, any logical (not to say physical) impossibility, in the adoption by all rational beings of the most outrageously immoral rules of conduct. All he shows is that the consequences of their universal adoption would be such as no one would choose to incur."
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John Stuart Mill, Utilitarianism, Ch. 1
https://en.wikiquote.org/wiki/Immanuel_Kant
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Immanuel Kant
1724 – 1804
deutscher Philosoph
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