He is a clinical narcissist. He does not have an objective sense of reality when it comes to himself. He genuinely thinks he is a strong athletic intimidating and beautiful person (jowls and all). He thinks he can out swim a female olympic swimmer, that he is smarter than PhD’s and MD’s, and that he has more political prowess than anyone in history. When he says he is the greatest president, the greatest golfer, the greatest… whatever… in history, he is not exaggerating for emphasis. He is deluded and actually believes it.