For the ancients, everything worth pursuing in life flowed from a strong sense of justice—or one’s commitment to doing the right thing, no matter how difficult. In order to be courageous, wise, and self-disciplined, one must begin with justice. The influence of the modern world often tells us that acting justly is optional. Holiday argues that that’s simply untrue—and the fact that so few people today have the strength to stand by their convictions explains much about why we’re so unhappy.