If you consciously say 'I won't do it!' to yourself, then you have a good chance that you won't.

You can't do everything. You can't do health and forestry and agriculture. You've got to focus and do one or the other.

Animals have personalities and minds and emotions.

A sense of calm came over me. More and more often I found myself thinking, "This is where I belong. This is what I came into this world to do.

I believe that accurate knowledge is very, very important, but find that out in free time. Don't let it take over every hour of the day. Perhaps most important, talk about it.

It is these undeniable qualities of human love and compassion and self-sacrifice that give me hope for the future. We are, indeed, often cruel and evil. Nobody can deny this. We gang up on each one another, we torture each other, with words as well as deeds, we fight, we kill. But we are also capable of the most noble, generous, and heroic behavior.

Other people have talked about chimpanzees being a window into the past, which I suppose is true, in a way.