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Moral law

The fundamental law of pure practical reason: it commands acting only on maxims fit to serve as universal legislation.

In the “Critique of Practical Reason” Kant states the moral law thus: “So act that the maxim of your will could always hold at the same time as a principle of a universal legislation.” It determines the will through the form of maxims alone — independently of all empirical ends.

The law, Kant holds, cannot be derived from anything else: our consciousness of it is a “fact of reason” that forces itself on every rational being. In the famous conclusion of the Critique, Kant places it beside “the starry heavens above me” — as “the moral law within me”.

Source: Wikipedia: Moral law