The Life of Blaise Pascal (La vie de Monsieur Pascal in French), first published in 1684 and written by Madame Jacqueline Perier, the sister of Blaise Pascal and wife of Monsieur Perier (an advisor to the Court of Aides of Clermont), is a biographical account that provides an intimate portrait of Pascal's life, personality, and religious journey, including a first-hand account of the moment of his death. Deeply involved in Pascal's life, Madame Perier offers a detailed description of his early intellectual brilliance, scientific achievements, and later conversion to a deeply spiritual life influenced by Jansenism. The biography also highlights Pascal's struggles with illness, his ascetic practices, and his deep religious convictions, especially his embrace of the doctrine of grace. Written with affection and insight, the work reflects both Pascal's human frailties and his extraordinary intellect and faith, portraying him as a complex figure who balanced rigorous scientific inquiry with devout Christian mysticism. This biography is essential for understanding Pascal's personal and spiritual development, as well as the family context that shaped much of his thought and work.