No More Learning

Now, as all determining principles of the will, except the law of pure practical reason alone (the moral law), are all empirical and, therefore, as such, belong to the           of happiness, they must all be kept apart from the supreme principle of morality and never be incorporated with it as a condition; since this would be to de-
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stroy all moral worth just as much as any empirical admixture with geometrical principles would destroy the certainty of mathematical evidence, which in Plato's opinion is the most excellent thing in mathematics, even surpassing their utility.