I will not attack your doctrines nor your creeds if they accord liberty to me. If they hold thought to be dangerous - if they aver that doubt is a crime, then I attack them one and all, because they enslave the minds of men.

The record of a generous life runs like a vine around the memory of our dead, and every sweet unselfish act is now a perfumed flower.

They say: Belief is important. I say: No, actions are important. Judge by deed, not by creed.

Heresy is a cradle; orthodoxy a coffin.

As long as a man lives he should study. Death alone has the right to dismiss the school.

We need men with moral courage to speak and write their real thoughts, and to stand by their convictions, even to the very death.

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.