"I am a better driver than you are, I drive more safely than you do, you are all idiot drivers while I am perfect. Well, maybe not perfect, sometimes I'm perfect, sometimes not, but I am always better and safer than you are at driving."
We always see our good points, rarely if ever our bad points. And our "bad points" are somehow always justified by circumstances beyond our control.
A prime example from someone I've known all my life is my big brother.
If you look at his facebook wall, you will see nothing but nature pictures he's taken, people he works with, and a post concerning how he's bought food for strangers without asking for anything in return.
What a saint!
However, some of us know better than to fall for that canard.
Why do we think of ourselves as so perfect?