"Read the best books first, or you may not have a chance to read them at all."

"If I am not I, who will be?"

"'Do not hire a man who does your work for money, but him who does it for love of it.'"

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

"The cost of a thing is the amount of what I will call life which is required to be exchanged for it, immediately or in the long run."