Known as one of the greatest of mathematicians and physicists, Pascal's fame long ago spread far beyond the confines of his native France. His contributions to the establishment of the mathematical theory of probability, to the science of hydrodynamics, to the study of gravity and the vacuum, and his elaboration of the theory of conic sections have given Pascal a lasting place among the great men of science. As a Christian thinker, his devotion to truth and piety, and his acceptance of mystical experience have made his name revered. His philosophical speculations and deep psychological insight, as well as his remarkable gifts as a writer of French prose have secured him a leading position among philosophers and literary historians. Pascal's Pensees, Thoughts, is one of the great books of the world.