Health is the soul that animates all the enjoyments of life, which fade and are tasteless without it.

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

I decided to sell my drawings. However, I didn't want people to buy my drawings because the professor of physics isn't supposed to be able to draw - isn't that wonderful - so I made up a false name.

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.

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