This one is hard, because it's difficult to pinpoint one thing and say "that's the best part".
Generally speaking, I think I'm a good person.
What makes me a good person?
-The fact that I don't generalise people based on their race, gender, sexual preference or other factors people can't control.
-I think people and the natural environment are more important than money. Without either, money is useless - yet a lot of ultra-conservative people lose sight of this.
I'm sure there are other reasons, but those two form the basis of many other arguments.