What happened to Blaise Pascal’s religious beliefs after his father became ill in 1646?

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French philosopher Blaise Pascal — Blaise Pascal Blaise Pascal, oil painting by an anonymous artist, c. 1650; in the Musée Carnavalet–Histoire de Paris, Paris. Pascal laid the foundation for probability theory.

Following his father’s illness in 1646, Blaise Pascal’s religious life underwent a profound transformation. Prior to this event, the Pascal family adhered to Roman Catholic principles that prioritized outward "polite respectability" over inward faith.

The illness brought Pascal into contact with two disciples of the abbé de Saint-Cyran, who introduced him to the austere moral and theological tenets of Jansenism. This movement, a 17th-century form of Augustinianism, emphasized predestination and taught that salvation was achieved through divine grace rather than human effort or good works.

Pascal was the first in his family to feel the necessity of turning away from worldly concerns toward God, and he successfully converted his family to this spiritual life in 1646. For several years, he served as his family’s spiritual adviser, though he continued to struggle with the tension between his scientific pursuits and his ascetic religious convictions until his later, more definitive conversion experience in 1654.1