be valid in advance of !
             experience ("a priori"). To Kant, the Categorical Imperative is only valid if the principle can be applied universally to any situation. "Act only according to that maxim by which you can at the same time will that it should become universal law" (pg. 323, Kant) If a maxim cannot facilitate this universal rule, it cannot become duty. Still, the question remains of how one can know that a maxim is truly valid and can fully consider itself applicable to universal law. Law
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