There is... Only a single categorical imperative and it is this: Act only on that maxim through which you can at the same time will that it should become a universal law.
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Original Citation
Kant, Immanuel. Grundlegung zur Metaphysik der Sitten [Groundwork of the Metaphysic of Morals]. Riga: J. F. Hartknoch, 1785.
Current Citation
Kant, Immanuel. Groundwork of the Metaphysics of Morals, translated by Mary Gregor and Jes Timmermann. Cambridge University Press, 2012.