"The study of logic is necessary, but it is not sufficient for the acquisition of knowledge."

"Many things are believed on mere custom, without any reason or proof."

"Theories are of no use unless they can be verified by experiment."

"The present generation is so corrupt that it despises the truth, and loves falsehood."

"There are many fables and falsehoods in the books of the Latins, which are taken for truths."