"The struggle for freedom is not a struggle for independence from control, but for control by oneself."

"The consequences of an act affect the probability of its occurring again."

"The organism is at the mercy of its environment."

"We are all controlled by the world in which we live, and we are all engaged in controlling the world in which we live."

"I am sometimes asked, 'Do you think of yourself as you think of the organisms you study?' The answer is yes."