Blaise Pascal was born in Clermont-Ferrand, France, in 1623, the son of a tax commissioner who oversaw his children's education with unusual care. By his early teens Pascal had already made original contributions to geometry, and by his twenties he had invented a mechanical calculating machine and conducted the experiments that would establish the physics of atmospheric pressure. He moved with equal ease through the salons of Paris and the rigors of the laboratory, a young man whose brilliance was broadly recognized and, to some degree, broadly indulged.
The France Pascal inhabited was one of fierce theological controversy. Jansenism, a reform movement that stressed human depravity and the absolute sovereignty of divine grace, had taken hold at the convent of Port-Royal, where Pascal's sister Jacqueline had become a nun. Pascal himself underwent a decisive spiritual experience on the night of November 23, 1654 — an encounter he recorded on a small parchment, sewn into his coat and kept against his body until his death. From that point, he gave himself increasingly to religious writing and to the defense of Port-Royal against its Jesuit critics, producing the sharply satirical Provincial Letters.
His enduring devotional legacy rests on the Pensées, a collection of fragments gathered after his death and published in 1670. Pascal had intended them as the skeleton of a formal apology for Christianity, addressed to the skeptical, educated unbeliever he knew from personal experience. The work probes human wretchedness and greatness with unsentimental precision, insisting that the heart has reasons reason does not know, and proposing what has come to be called the Wager — the argument that the stakes of belief are simply too consequential to dismiss. Pascal died in 1662 at thirty-nine, after years of painful illness borne with studied patience.
His writings remain among the most searching invitations to Christian faith that Western letters have produced, trusted by readers precisely because they concede so much to doubt.