If labor mainly, or to any considerable degree, serves the purpose of a police, to keep men out of mischief, it indicates a rottenness at the foundation of our community.

I live in the present. I only remember the past, and anticipate the future.

Being a teacher is like being in jail; once it's on your record, you can never get rid of it.

The tree of Knowledge is a Tree of Knowledge of good and evil.

Ex oriente lux may still be the motto of scholars, for the Western world has not yet derived from the East all the light which itis destined to receive thence.

By my intimacy with nature I find myself withdrawn from man. My interest in the sun and the moon, in the morning and the evening, compels me to solitude.

The stars are the apexes of what wonderful triangles! What distant and different beings in the various mansions of the universe are contemplating the same one at the same moment!