Well, I know, of course, how important it is not to keep a business engagement, if one wants to retain any sense of the beauty of life.

“I never quarrel with actions. My one quarrel is with words”

“it was never to accept any theory or system that would involve the sacrifice of…”

“One should always be a little improbable.”

“It often happened that when we thought we were experimenting on others we were …”