"The only real security that a man can have in this world is a reserve of knowledge, experience, and ability."

"I can do a great deal of work without any food, but I cannot do any work without sleep."

"The greatest discovery of all time is that a person can change his future by merely changing his attitude."

"I like to do my own thinking."

"A man always has two reasons for doing anything: a good reason and the real reason."