Sartre contemplates the human emotional experience by analyzing phenomenological psychology and existentialism. In The Emotions: Outline of a Theory, French philosopher Jean-Paul Sartre attempts to understand the role emotions play in the human psyche. Sartre analyzes fear, lust, anguish, and melancholy while asserting that human beings begin to develop emotional capabilities from a very early age, which helps them identify and understand the emotions' names and qualities later in life.