"Looking to the world at no very distant date, what an endless number of the lower races will have been eliminated by the higher civilized races throughout the world."

"The greatest discovery of all is that the world is not as we thought it was."

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

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

"The highest possible stage in moral culture is when we recognize that we ought to control our thoughts."