Durant wrote the quote, not Aristotle. For years, the alleged words of ancient Greek philosopher Aristotle purporting to define excellence as a practice have circulated on the internet.

Key points. According to Aristotle, it is impossible to define virtue with any precision. Instead, each virtue resides in the rough mean between its excess and its deficiency.

Durant wrote the quote, not Aristotle. For years, the alleged words of ancient Greek philosopher Aristotle purporting to define excellence as a practice have circulated on the internet.