"Man, being the servant and interpreter of Nature, can do and understand so much only as he has observed in fact or in thought of the course of nature: beyond this he neither knows anything nor can do …"

"To be ignorant of causes is to be frustrated in action."

"For in the mind of man, there is a natural evil, a natural darkness, which, unless it be purged and illuminated, will ever be prone to error."

"The honest and just man is a perpetual censor."

"For good and evil, there is no place for neutrality."