Blaise Pascal

Life and legacy

Blaise Pascal was born on 19 June 1623 in Clermont-Ferrand to Etienne Pascal, a talented mathematician and judge, and Antoinette Begon, who died when Blaise was three. His father moved the family to Paris in 1631 and personally supervised his son's education, initially withholding mathematics to focus on languages. When the twelve-year-old Blaise independently discovered that the sum of the angles of a triangle equals two right angles, Etienne relented and gave him access to Euclid's Elements. By sixteen, Pascal had written an original treatise on conic sections that astonished the mathematical community.

Pascal's contributions to science and mathematics were extraordinary in their range. At nineteen he invented the Pascaline, one of the earliest mechanical calculators, to help his father with tax computations. In 1647 he conducted experiments confirming Torricelli's theory of atmospheric pressure, demonstrating that the weight of air decreases with altitude - a finding that refuted the Aristotelian doctrine that nature abhors a vacuum. In correspondence with Pierre de Fermat in 1654, he co-founded the mathematical theory of probability, which would eventually transform fields from insurance and statistics to quantum physics.

A near-fatal carriage accident on the Pont de Neuilly in 1654, followed by a profound religious experience on the night of 23 November 1654, turned Pascal decisively toward faith. He became associated with the Jansenist community at Port-Royal and wrote the Lettres provinciales (1656-1657), a devastating and witty attack on Jesuit casuistry that is considered a masterpiece of French prose. The letters were so effective that they were banned and publicly burned, but they helped shape French literary style for generations.

Pascal spent his final years working on an ambitious defense of the Christian religion, but chronic illness prevented him from completing it. The fragments he left behind were published posthumously as the Pensees (1670), a work of extraordinary depth and literary power. In it, Pascal explored the paradox of human greatness and wretchedness, the limits of reason, and the existential choice of faith. His famous "Wager" - arguing that it is rational to believe in God because the potential gain is infinite while the potential loss is finite - remains one of the most discussed arguments in the philosophy of religion.

Pascal died in Paris on 19 August 1662, at the age of thirty-nine. The SI unit of pressure (the pascal) is named in his honor, a testament to the enduring significance of his scientific work.

Key accomplishments

• Co-founded probability theory through correspondence with Pierre de Fermat (1654)
• Invented the Pascaline, one of the earliest mechanical calculators (1642)
• Demonstrated atmospheric pressure varies with altitude, refuting the horror vacui doctrine
• Wrote the Lettres provinciales (1656-1657), a masterpiece of polemical French prose
• Left behind the Pensees, one of the most profound philosophical-religious works in Western literature

Timeline

The dated lines from the record above, in order, with Blaise Pascal's age worked out from the birth year (1623).

1. 1623Born 19 June 1623, Clermont-Ferrand, France
2. 1642Invented the Pascaline, one of the earliest mechanical calculators (1642) (around age 19)
3. 1654Co-founded probability theory through correspondence with Pierre de Fermat (1654) (around age 31)
4. 1656Wrote the Lettres provinciales (1656-1657), a masterpiece of polemical French prose (around age 33)
5. 1662Died 19 August 1662, Paris, France

Quotes

Le coeur a ses raisons, que la raison ne connait point. (The heart has its reasons, which reason knows nothing of.)

Pensees, Section IV, No. 277 (posthumously published, 1670)

Man is but a reed, the most feeble thing in nature; but he is a thinking reed.

Pensees, Section VI, No. 347 (posthumously published, 1670)

Related figures

Where Blaise Pascal sits in the atlas

• Era: Scientific Revolution & Enlightenment (~1600-1800), one of 16 figures filed there
• Born 1623, the 66th of 125 figures in the full list by birth year.
• City: Paris

Contemporaries

6 other figures in the atlas were alive at some point during Blaise Pascal's lifetime (1623-1662).

• Rembrandt van Rijn (1606-1669): both alive for 39 years, 1623 to 1662
• John Locke (1632-1704): both alive for 30 years, 1632 to 1662
• Rene Descartes (1596-1650): both alive for 27 years, 1623 to 1650
• Galileo Galilei (1564-1642): both alive for 19 years, 1623 to 1642
• Isaac Newton (1643-1727): both alive for 19 years, 1643 to 1662
• Francis Bacon (1561-1626): both alive for 3 years, 1623 to 1626

Others connected with the same city

Figures not already listed on this page, nearest in time first.

More from Scientific Revolution & Enlightenment

Figures from the same era born closest in time to Blaise Pascal.

• Johann Sebastian Bach (1685-1750), Supreme Master of Western Music
• Adam Smith (1723-1790), Father of Modern Economics
• Immanuel Kant (1724-1804), Architect of Critical Philosophy
• Catherine the Great (1729-1796), Empress Who Made Russia a European Power
• Wolfgang Amadeus Mozart (1756-1791), The Divine Prodigy