**Pascal's Pensées** by Blaise Pascal is a collection of fragments written in the 17th century. Left incomplete at Pascal's death in 1662, these notes were intended as a defense of Christianity. The work introduces "Pascal's wager" and challenges both cosmological proofs of God and atheist critiques of faith. Pascal argues that God is hidden and found only through sincere seeking. Published posthumously in 1670, the fragments' intended order remains debated, inspiring numerous editions and influencing thinkers from Heidegger to Sartre.