Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Existentialism is a Humanism (L''existentialisme est un humanisme) is a 1946 philosophical work by Jean-Paul Sartre. It is seen by many as one of the defining texts in the Existentialist movement. In his text, Sartre says that the key defining point of Existentialism is that the existence of a person comes before his or her essence. In simple terms, this means that, although that person exists, there is nothing to dictate that person''s character, goals in life, and so on. Only the person themselves can define their essence.