I think the most important thing is to keep active, and to hope that your mind stays active.

My mission is to create a world where we can live in harmony with nature. And can I do that alone? No. So there is a whole army of youth that can do it. So I suppose my mission is to reach as many of those young people as I can through my own efforts.

Especially now when views are becoming more polarized, we must work to understand each other across political, religious and national boundaries.

It would be absolutely useless for any of us to work to save wildlife without working to educate the next generation of conservationists.

Every stage of my life set the scene for the next, and at each point all I had to do was say "yes" and not think too much about the consequences.

I never wanted to give up. I thought I might have to. Especially at the beginning when chimpanzees had never seen a white person before.They gave one look at me and ran away! They were scared, but eventually I got their trust.

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.