The Stoics think that correct judgments about choices and externals affect how we feel. A well-developed character and faculty of choice knows the difference between virtue and vice in choice and positive and negative in externals. Further, the development of one’s judgment is itself an object of morality. If I am not well developed, if I consistently choose externals over virtue, or choose externals that harm my character, I have bad judgment. Correct and incorrect judgments are products of my understanding of physics and logic. This is why the Stoics think physics and logic, the other two to
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