I don't have any idea of who or what God is. But I do believe in some great spiritual power. I feel it particularly when I’m out in nature. It’s just something that's bigger and stronger than what I am or what anybody is. I feel it. And it's enough for me.

It was both fascinating and appalling to learn that chimpanzees were capable of hostile and territorial behavior that was not unlike certain forms of primitive human warfare.

We could change the world tomorrow if all the millions of people around the world acted the way they believe.

Science demands objective factual evidence - proof; spiritual experience is subjective and leads to faith.

I still think we are smart enough to not destroy planet Earth, our only home.

I always loved animals. And when I was ten, I decided I had to go to Africa and live with animals and write books about them.

To me, trees are living beings and they have their own sort of personalities.