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.

It is a mania shared by philosophers of all ages to deny what exists and to explain what does not exist.

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.

We shall see but a little way if we require to understand what we see.