The use of a thing is only a part of its significance. To know anything thoroughly, to have the full command of it in all its appliances, we must study it on its own account, independently of any special application.

The universal subjugator, the commonplace.

Let no one be ashamed to say yes today if yesterday he said no. Or to say no today if yesterday he said yes. For that is life. Never to have changed-what a pitiable thing of which to boast!

Science and art belong to the whole world, and before them vanish the barriers of nationality.

The highest happiness of man ... is to have probed what is knowable and quietly to revere what is unknowable.

It is opposition that makes us productive.

I am very anxious to please the public, particularly as it lives and lets live.