Book excerpt: The idea that happiness is a choice accessible to all is far from new; the ancient Greek philosopher Epicurus developed the Natural Philosophy of life over two thousand years ago, providing practical, contemporary guidelines to finding meaning and happiness. Unlike Plato, who valued the divine logic above all, Epicurus argued that the pursuit of ideals produced by logic alone leads to inner conflict, cognitive dissonance, dissatisfaction, and even depression. He suggested that by first embracing our natural desires, then using logic to determine which choices will increase pleasure over time, and using our will to take action, we could learn and change, and achieve happiness. Join the author Haris Dimitriadis on a journey through the history of philosophical thought, as well as an in-depth look at the modern neuroscience, psychology, and astrophysics, and discover why the ancient Epicurean Philosophy of Nature matters as much today as it did two thousand and three hundred years ago!