Joy, sadness, jealousy, and admiration - these and other emotions form the core of our daily lives. Considered too private to be explained scientifically and unnecessary for understanding human reasoning, they have largely been overlooked. But not by the great 17th-century Dutch philosopher, Spinoza. Nor by Antonio Damasio. In this book, Dr. Damasio draws from his groundbreaking research and his experience with neurological patients to examine how emotions and the feelings underlying them contribute to the management of human affairs.