“One of the chief obstacles to intelligence is credulity, and credulity could be enormously diminished by instruction in the prevalent forms of mendacity.”

“Man is a credulous animal, and must believe something; in the absence of good grounds for belief, he will be satisfied with bad ones.”

“So far as I can remember there is not one word in the Gospels in praise of intelligence.”

“Dogmatism is the greatest of mental obstacles to human happiness.”

“[If] we wish to diminish the love of money which, we are told, is the root of all evil, the first step must be the creation of a system in which everyone has enough and no one has too much.”

“Freedom in general may be defined as the absence of obstacles to the realization of desires.”

“Find more pleasure in intelligent dissent than in passive agreement, for, if you value intelligence as you should, the former implies a deeper agreement than the latter.”