Teach to the young, men's enduring truths, and let the learned amuse themselves with their passing errors.

Unfortunately, 19th-century scientists were just as ready to jump to the conclusion that any guess about nature was an obvious fact, as were 17th-century sectarians to jump to the conclusion that any guess about Scripture was the obvious explanation . . . . and this clumsy collision of two very impatient forms of ignorance was known as the quarrel of Science and Religion.

If our caricaturists do not hate their enemies, it is not because they are too big to hate them, but because their enemies are not big enough to hate.

If the devil tells you something is too fearful to look at, look at it. If he says something is too terrible to hear, hear it. If you think some truth unbearable, bear it.

All democrats object to men being disqualified by the accident of birth; tradition objects to their being disqualified by the accident of death.

The only words that ever satisfied me as describing nature are the terms used in fairy books, charm, spell, enchantment; they express the arbitrariness of the fact and its mystery.

Great truths can only be forgotten and can never be falsified.