Who said “It is not human nature we should accuse but the despicable conventions that pervert it.”?

“There seems to be some perverse human characteristic that likes to make easy things difficult.”

“What is called an acute knowledge of human nature is mostly nothing but the observer's own weaknesses reflected back from others.”

“The only thing that one really knows about human nature is that it changes. Change is the one quality we can predicate of it. The systems that fail are those that rely on the permanency of human nature, and not on its growth and development. The error of Louis XIV was that he thought human nature would always be the same. The result of his error was the French Revolution. It was an admirable result.”

“Human nature is not of itself vicious.”

“There is a great deal of human nature in people.”

“Good music is very close to primitive language.”

“There is only one passion, the passion for happiness.”

“Poetry must have something in it that is barbaric, vast and wild.”

“The blood of Jesus Christ can cover a multitude of sins, it seems to me.”

“All abstract sciences are nothing but the study of relations between signs.”

“Gaiety --a quality of ordinary men. Genius always presupposes some disorder in the machine.”