“I hope that I may die before my mind fails to a sensible extent.”

“Man in his arrogance thinks himself a great work worthy the interposition of a deity. More humble, and I believe truer, to consider him created from animals.”

“I love fools' experiments. I am always making them.”

“How odd it is that anyone should not see that all observation must be for or against some view if it is to be of any service!”

“What a book a Devil's chaplain might write on the clumsy, wasteful, blundering, low, and horridly cruel works of nature!”

“Though the theory is worthless without the well-observed facts, the facts are useless without the frame of the theory to receive them.”

“Happiness is the final and perfect fruit of obedience to the laws of life.”

“The highest result of education is tolerance.”

“Example is the best lesson there is.”

“Only a man's character is the real criterion of worth.”

“It isn't enough to talk about peace. One must believe in it. And it isn't enough to believe in it. One must work at it.”

“In the long run, we shape our lives and we shape ourselves. The process never ends until we die. And the choices we make are ultimately our own responsibility.”