What is the philosophy of Jean-Paul Sartre? ). Existentialism is Humanism is a doctrine that makes human life possible and affirms every truth and action of the environment and human subjectivity. Existentialism centers on the fact that those believing in it believe that existence comes before essence. "This simply means that man first is, and only subsequently is this or that. In a word, man must create his own essence" (Sartre 1). This means man is thrown into the world to do the best he can do. It may mean different types of suffering, struggling, and overcoming obstacles but he creates who he is. The definition of a man is means it is always open-ended because he continues to change. No one can say what he is until he dies, then can he actually know who the person is?
