"I have no great quickness of apprehension or wit which is so remarkable in some clever men, but I have a fair share of invention and of common sense."

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

"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."

"It is always best to be a little under rather than over the mark."

"The world will not be inherited by the strongest, it will be inherited by those most able to change."