Hume's Law says that you cannot have a cogent moral argument without at least one normative premise.

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Hume's Law, also known as the is-ought problem, posits that you cannot derive an ought (a normative statement about what should be) from an is (a descriptive statement about what is) without including at least one normative premise in your argument. This principle suggests that moral conclusions require at least one moral or normative premise to be logically valid.

Hume's Law Says That You Cannot Have a Cogent Moral