Some humans are mathematicians-others aren't.

Just remember--if you are really and truly determined to work with animals, somehow, either now or later, you will find a way to do it. But you have to want it desperately, work hard, take advantage of an opportunity--and never give up.

If we kill off the wild, then we are killing a part of our souls.

I think the best evenings are when we have messages, things that make us think, but we can also laugh and enjoy each other's company.

War had always seemed to me to be a purely human behavior. Accounts of warlike behavior date back to the very first written records of human history; it seemed to be an almost universal characteristic of human groups.

It's up to us to save the world for tomorrow: it's up to you and me.

there have been too many events in my life, and in the lives of my friends, which have defied any kind of scientific explanation. Science does not have appropriate tools for the dissection of the spirit.