"The light which puts out our eyes is darkness to us. Only that day dawns to which we are awake. There is more day to dawn. The sun is but a morning star."

"If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them."

"The only obligation which I have a right to assume is to do at any time what I think right."

"To be awake is to be alive. I have never yet met a man who was quite awake. How could I have looked him in the face?"

"I would rather be a wood-chopper than a professor of ethics."