When the will defies fear, when duty throws the gauntlet down to fate, when honor scorns to compromise with death - that is heroism.

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

Every man who expresses an honest thought is a soldier in the army of intellectual liberty.

To avoid pain we must know the conditions of health. For the accomplishment of this end we must rely upon investigation instead of faith, upon labor in place of prayer. Most misery is produced by ignorance. Passions sow the seeds of pain.

Blasphemy is an epithet bestowed by superstition upon common sense.

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 idea that there is a God who rewards and punishes, and who can reward, if he so wishes, the meanest and vilest of the human race, so that he will be eternally happy, and can punish the best of the human race, so that he will be eternally miserable, is subversive of all morality.