"I have always taken a delight in observing the various phenomena of nature, and in trying to find out their causes."

"I have always looked upon the study of nature as a kind of religious duty."

"Experiment, without reason, is blind; reason, without experiment, is lame."

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

"I have often observed, that those who have a great esteem for their own opinions, are very apt to despise those of others."