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

The more we spread the word, the further it will go and more it will change!

It's been proven by quite a few studies that plants are good for our psychological development. If you green an area, the rate of crime goes down. Torture victims begin to recover when they spend time outside in a garden with flowers. So we need them, in some deep psychological sense, which I don't suppose anybody really understands yet.

I think we must cling to the hope that we can see in the great heroism, the bravery of the firemen and policemen, and the outpouring of caring and concern that has come pouring in from around the world.

One cannot watch chimpanzee infants for long without realizing that they have the same emotional need for affection and reassurance as human children.

I wasn't trying to be a scientist. I only ever wanted to be a naturalist, like a David Attenborough.

When I was a child, the African forest sounded like a dream to me, because it was full of animals and it was wild.