"The greatest enemy of any one of our truths may be the rest of our truths."

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

"Man, biologically considered, and whatever else he may be into the bargain, is the most formidable of all the beasts of prey."

"There is no more miserable human being than one in whom nothing is habitual but indecision."

"The world is continuous, and we are part of its continuity."