"I can't imagine living without hope. It's what keeps me going."

"We are, indeed, often cruel and evil. Nobody can deny this. We gang up on one another, we torture each other, we use our intellect to manipulate, we kill."

"I remember once watching a chimpanzee trying to open a nut with a stone, and it was so frustrated, it just threw the stone down and screamed. I understood exactly how it felt."

"We need to educate the next generation about the importance of protecting the environment."

"Chimpanzees are so like us, they have a very human-like capacity for evil."