What is ego?

Our ego is the most important object of our property feeling, for it comprises many things: our body, our name, our social status, our possessions (including our knowledge), the image we have of ourselves and the image we want others to have of us. Our ego is a mixture of real qualities, such as knowledge and skills, and of certain fictitious qualities that we build around a core of reality. But the essential point is not so much what the ego's content is, but that the ego is felt as a thing we each posses, and that this "thing" is the basis of our sense of identity.