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Quotation from Critique of Practical Reason by Immanuel Kant
“Act so that the maxim of thy will can always at the same time hold good as a principle of universal legislation.”
Critique of Practical Reason, Book I, Chapter I, section 7 (Fundamental Law of the Pure Practical Reason), trans. Thomas Kingsmill Abbott (1889)

The second Critique's single formulation of the categorical imperative.
Citation: "Act so that the maxim of thy will can always at the same time hold good as a principle of universal legislation." — Immanuel Kant, Critique of Practical Reason, Book I, Chapter I, section 7 (Fundamental Law of the Pure Practical Reason), trans. Thomas Kingsmill Abbott (1889). (id kant-critique-of-practical-reason-q2)
Portrait: Immanuel Kant - Gemaelde 2, Becker, Public domain.
