With the fearful strain that is on me night and day, if I did not laugh I should die.

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.

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

I am fond of pigs. Dogs look up to us. Cats look down on us. Pigs treat us as equals.