We know that we don't know everything about ouselves , because we discover things about ourselves everyday. What if you had a complete understanding of yourself , such as all the stuff going on in the unconscious part like implicit opinions. Could you still be yourself? Will still have purpose or a drive? or would you lack it due to being content with the self , or frozen in thoughts. It seems like It's impossible to truly know ourselves , because not only of the information in the unconscious part , but the evolution of our personality as we experience more things. We would have to somehow freeze time to prevent new experiences , while trying to not make the efforts of investigating this not an experience of in itself.