"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."

"Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult—at least I have found it so—than constantly to bear this conclusion in mind."

"But I am very poorly today & very stupid & I hate everybody & everything. One lives only to make blunders."

"Man tends to increase at a greater rate than his means of subsistence."

"No one can feel more strongly than I do the extreme difficulty of accounting for the origin of species."