While Greek philosophers such as Socrates and Aristotle debated what makes humans morally good, Epicurus was more concerned with what makes us happy. The ancient thinker theorized that friends, free time, and self-improvement were all key to happiness, and he formed communes where these beliefs were put into practice. His words here remind us that if we live with integrity, with the ideas of justice and empathy never far from our center, then peace of mind is a natural side effect, as is the contentment that it provides.