Think about it: there is no experience you have had that you are not the absolute centre of. The world as you experience it is there in front of YOU or behind YOU, to the left or right of YOU, on YOUR TV or YOUR monitor. And so on. Other people’s thoughts and feelings have to be communicated to you somehow, but your own are so immediate, urgent, real.
This particular point really intrigued me because he is expressing the fact that people aren’t always necessarily paying attention to one individual specifically even though we think they might be, which is what makes people less focused on others around them, this being the issue addressed throughout the speech.