"The tragedy of culture is that objective culture, once created, becomes estranged from the subjective spirit that produced it."

"The human being is an animal that can say 'no'."

"The essence of secrecy is that it is a form of power."

"The metropolis exacts from man a different kind of consciousness than does rural life."

"Perhaps one has to have placed life in the center of one's worldview and valued it as much as I have in order to know that one may not keep it, but must yield it up."