Blaise Pascal (1623-1662) made important contributions to mathematics, the theory of probability, and several scientific fields, was one of the inventors of the first mathematical calculator, and was also a deeply religious thinker who grappled with issues concerning the existence of God, the possibility of human salvation, and the sinfulness of human life. His famous Wager is often discussed, but there is much else of interest and relevance in his thought which remains undiscovered. This book provides an accessible yet detailed account of Pascal's philosophy and how it applies to important issues facing all of us today, as well as novel interpretations of Pascal's ideas. It will stimulate and challenge anyone who is interested in the role of the heart in rationality, human nature, our relation to reality and our individual and collective purpose, and the underexplored thoughts of one of history's greatest geniuses.