For millennia, people have been searching for happiness. Yet the more we think about happiness, the less we seem to see the way forward amidst all the signposts. The ancient theories of Epicurus, Aristotle, or Stoicism can breathe new life into modern debates. By rediscovering their reflections on self-efficacy, virtue, and contemplation, a bridge can be built between antiquity and modernity—over which we may one day step towards happiness. Ines Maria Eckermann provides a detailed and structured overview of ancient happiness theories, connecting them with insights from modern happiness research. Throughout, she never loses sight of the very real, everyday implications of her subject of study.