Now, since all determining bases of the will except for the single pure practical law of reason (the moral law) are one and all empirical and hence, as such, belong to the principle of happiness, they must one and all be separated from the supreme moral principle and never be incorporated in it, because this would annul all moral worth just as much as an empirical admixture to geometric principles would annul all mathematical self evidence, which (in Plato's judgment) is the most excellent thi that mathematics possesses, surpassing even all its utility.