Blaise Pascal 
Pensées 

Pascal’s Pensées‘ is a collection of fragments on theology and philosophy written by 17th-century philosopher and mathematician Blaise Pascal. Pascal’s religious conversion led him into a life of asceticism and the Pensées was in many ways his life’s work. This book represented Pascal’s defense of the Christian religion. The concept of ‚Pascal’s Wager‘ stems from a portion of this work.