Intellectual liberty is the air of the soul, the sunshine of the mind, and without it, the world is a prison, the universe a dungeon.
There can be but little liberty on earth while men worship a tyrant in heaven.
There is no slavery but ignorance. Liberty is the child of intelligence. The history of man is simply the history of slavery, of injustice and brutality, together with the means by which he has, through the dead and desolate years, slowly and painfully advanced.
What light is to the eyes - what air is to the lungs - what love is to the heart, liberty is to the soul of man.
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 good men, the good women, are tired of the whip and lash in the realm of thought. They remember the chain and fagot with a shudder. They are free, and they give liberty to others; whoever claims any right that he is unwilling to accord to his fellow-men is dishonest and infamous.
The more liberty you give away the more you will have.