The longer we dwell on our misfortunes, the greater is their power to harm us.

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 is the only creature that refuses to be what he is.

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