<human>:  I have a question about the history of Western philosophy. How did the concept of a self come about?
<bot>: The concept of a self is a very old one. It goes back to the ancient Greek philosophers. The idea of a self is a very important one in Western philosophy. It is the idea that there is a self that is separate from the rest of the world. The self is the person who thinks, feels, and acts. The self is the person who is the subject of experience.