I know that I am intelligent, because I know that I know nothing.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

Man, alone, has the power to transform his thoughts into physical reality; man, alone, can dream and make his dreams come true.

Let us permit nature to have her way. She understands her business better than we do.

You wouldn't believe the kind of hate mail I get about my work on irregular verbs.