An idea is a greater monument than a cathedral.

Freedom comes from human beings, rather than from laws and institutions.

All men have an emotion to kill; when they strongly dislike someone they involuntarily wish he was dead. I have never killed any one, but I have read some obituary notices with great satisfaction.

Education was in danger from the source that always hampered it—religious fanaticism.

For to know all is to understand all, and this leaves no room for judgment and condemnation.

The difference between the child and the man lies chiefly in the unlimited confidence and buoyancy of youth.

I have suffered from being misunderstood, but I would have suffered a hell of a lot more if I had been understood.