In his text, Sartre says that the key defining point of Existentialism is that the existence of a person comes chronologically 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 himself can define his essence. Thus, Sartre rejects what he calls "deterministic excuses" and claims that all people must take responsibility for their behaviour. Sartre defines angst and despair as the emotions people feel once they come to realize that they are responsible for all of their actions. He also describes forlornness as loneliness atheists feel when they realize that they are all alone, that there is no God to watch over them. This is associated with despair and angst.