Born in Paris, Jean-Paul Sartre’s philosophy is an unsystematic collection of plays and novels. Focusing attention of the meaning of existence, he concludes that there is no reason people should exist. But since they do exist, they should freely make their own decisions. Although Sartre stressed that decisions should be personal, unaided by religion, morality or society, he was active in the French Resistance during WWII. He believed that people should rebel against authority, and yet in his later years, Sartre moved from existentialism to social communism.