Chimps act the way they feel unless they are afraid of reprisal if they do so. But that doesn't apply to humans.

I feel a desperation to make people see what we are doing to the environment, what a mess we are making of our world. At this point, the more people I reach, the more I accomplish. ... I miss Gombe and my wonderful years in the forest But if I were to go back to that, I wouldn't feel I was doing what I should be doing.

I just have this absolute belief that humans are moving away from cruelty and destruction towards a time when we can truly live in harmony with nature. When we understand that there is a spiritual power around us from which we can draw strength. That is where I believe human destiny ultimately is taking us. I just hope we have time.

Being evil is something that only humans are capable of.

A sense of calm came over me. More and more often I found myself thinking, "This is where I belong. This is what I came into this world to do.

The person who has the most influence on me is my mother. Think of life as a flight where we fly higher and higher. If I were a bird that needs feathers to fly higher, I would regard my mother as my strongest feather.

Certainly, if you look at human behavior around the world, you have to admit that we can be very aggressive.