Blaise Pascal was one of the most brilliant physicists and mathematicians of the 17th century, the inventor of the Pascaline calculator and the namesake of Pascal's triangle and Pascal's law. Yet his most famous contribution to human thought treats eternal salvation like a high-stakes casino bet. This deep dive traces how a rigorous scientist, shaped by the austere Jansenist movement and haunted by the limits of human reason, concluded that the existence of God could never be proven and turned instead to the emerging mathematics of probability.

We break down the mechanics of Pascal's Wager through expected value, explore his surprisingly modern behavioral advice to skeptics who cannot make themselves believe, and examine the fierce critiques from Voltaire, Diderot, and William James, including the predestination problem and the many gods ob ...