"I have tried to be a good boy, and I have done my best."

"The difference in mind between man and the higher animals, great as it is, certainly is one of degree and not of kind."

"It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is most adaptable to change."

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

"It is a wonderful fact that we can understand so much."