"If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week."

"The very existence of our senses, our reason, and our intellect, is a proof that these faculties were given us for some purpose."

"I see no good reason why the views given in this volume should shock the religious feelings of any one."

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

"I have just finished my 'Origin,' and am now going to be a hermit for the rest of my life."