"Our errors are not so much new and unheard of as they are old ones, dressed up in new clothes."

"Habit is the enormous fly-wheel of society, its most precious conservative agent."

"The world is not a finished product, but a process, and we are part of its making."

"There are no such things as facts, only interpretations."

"What is new is not necessarily true, and what is true is not necessarily new."