Intellect, without heart, is infinitely cruel. . . . So that, after all, the real aristocracy must be that of goodness where the intellect is directed by the heart.

No one, in the world's whole history, ever attempted to substantiate a truth by a miracle. Truth scorns the assistance of miracle. Nothing but falsehood ever attested itself by signs and wonders. No miracle ever was performed, and no sane man ever thought he had performed one, and until one is performed, there can be no evidence of the existence of any power superior to, and independent of nature.

It is perfectly delightful to take advantage of the conscientious labors of those who go through and through volume after volume, divide with infinite patience the gold from the dross, and present us with the pure and shining coin. Such men may be likened to bees who save us numberless journeys by giving us the fruit of their own.

Religion can never reform mankind because religion is slavery.

All religions are inconsistent with mental freedom. Shakespeare is my bible, Burns my hymn-book.

Religion has not civilized man, man has civilized religion.

If the account given in Genesis is really true, ought we not, after all, to thank this serpent? He was the first schoolmaster, the first advocate of learning, the first enemy of ignorance, the first to whisper in human ears the sacred word liberty, the creator of ambition, the author of modesty, of inquiry, of doubt, of investigation, of progress and of civilization.