Aristotle lectures on how to live well, and the notes his students took have become one of the foundational texts of Western moral philosophy. Virtue is a mean between extremes; happiness is activity in accordance with virtue; the highest good is contemplation. The prose is not elegant; these are lecture notes, not polished essays. But the thinking is rigorous, practical, and strangely comforting. Aristotle assumes we want to be good and simply need to understand how. The ethics is inseparable from politics; humans are political animals who flourish only in communities. Twenty-three centuries later, philosophers still begin here.