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.

In the presence of eternity, the mountains are as transient as the clouds.

Not only are we here to protect the public from vicious criminals in the street but also to protect the public from harmful ideas.

Ignorance worships mystery; reason explains it; the one grovels, the other soars.

By physical liberty I mean the right to do anything which does not interfere with the happiness of another. By intellectual liberty I mean the right to think and the right to think wrong.

Let us agree not to step on each other’s feet.

Mental slavery is mental death, and every man who has given up his intellectual freedom is the living coffin of his dead soul.