"The heresy of one age becomes the orthodoxy of the next."

"The worst kind of heretic is one who, teaching for the most part true Catholic doctrine, adds a word of heresy like a…"

"Wherefore if forgers of money and other evil-doers are forthwith condemned to death by the secular authority, much mo…"

"Science is in far greater danger from the absence of challenge than from the coming of any number of even absurd chal…"

"The essence of the heretic, that is to say of someone who has a particular opinion, is that he clings to his own idea…"

"Heresies have never been more than particular opinions, since they began with five or six men."

"And so we get an idea of the real fundamental meaning of the words Catholic and heretic. A heretic is one who has his…"

"Religions are kept alive by heresies, which are really sudden explosions of faith. Dead religions do not produce them."

"All errors that have existed in the Christian Church from the beginning, proceeded from this source, that in some per…"

"In corporation religions as in others, the heretic must be cast out not because of the probability that he is wrong b…"