Something excels, in this sense, if it performs its function well. Humans excel when they think clearly and reason well about their lives, which amounts to living wisely. The Stoics adopted the Socratic division of cardinal virtues into wisdom, justice, courage, and moderation. The other three virtues can be understood as wisdom applied to our actions in different areas of life. Justice is largely wisdom applied to the social sphere, our relationships with other people. Displaying courage and moderation involves mastering our fears and desires, respectively, overcoming what the Stoics called
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