“Human history is a Gaian dream.”

“The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error. But science is one of the very few human activities — perhaps the only one — in which errors are systematically criticized and fairly often, in time, corrected. This is why we can say that, in science, we often learn from our mistakes, and why we can speak clearly and sensibly about making progress there.”

“The history of the human race is the history of human hatred. Even love cannot erase such intense hatred.”

“The history of humanity is, to a very great extent, a history of violence.”

“Because the human history is the history of shoes. The history of places where we ever tread and stand.”

“Because some things that seem unimportant now can change the course of human history -- and I am a student of human history.”