"Women ought not to meddle in matters of philosophy."

"If a man will not be a fool, he must not be a dogmatist."

"I have always been of the opinion, that the best way to discover the secrets of nature, is to interrogate her by experiments."

"I once kept a viper in a sealed glass jar until it died, to observe the effects of air deprivation."

"I have often thought that the greatest riches are those of the mind."