One of America's best known social and political philosophers, Sidney Hook, compiled this fascinating combination of essays, popular and technical, addressing questions by professionals and lay readers alike. Written between 1934 and 1960, these controversial essays generated heated discussion and polemic, the echoes of which are still being heard. Championing secularism, humanism, and naturalism, Hook eloquently argues against the claim that religious experience and metaphysical insight alone can discover truths about existence and reality that rest outside the domain of scientific method or inquiry. Crucial philosophical questions are discussed: What is the role of philosophy in life? Is philosophical knowledge possible, as distinct from scientific and commonsense knowledge? Does determinism vacate moral responsibility? Do religious and metaphysical beliefs possess cognitive meaning? What is the core dispute between materialism and idealism? Hook's provocative analyses will not only clarify these questions but stimulate readers to reassess their own views.