Pascal 's Wager ( or Pascal 's Gambit ) the name for an idea , Blaise Pascal had . He said that it is not possible to prove that God exists . Pascal 's Wager ( or Pascal 's Gambit ) is a suggestion posed by the French philosopher , mathematician and physicist Blaise Pascal that , even though the existence of God can not be determined through reason , a person should wager as though God exists , because living life accordingly has everything to gain , and nothing to lose .