If we get our self-esteem from superficial places, from our popularity, appearance, business success, financial situation, health, any of these, we will be disappointed, because no one can guarantee that we'll have them tomorrow.
I think the biggest problem in the world is that we have a generation of young people, and maybe two, who don't think it's going to get any better.
We don't know all the answers. If we knew all the answers we'd be bored, wouldn't we? We keep looking, searching, trying to get more knowledge.

