"He who understands baboon would do more towards metaphysics than Locke."

"The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic."

"Man is descended from a hairy, tailed quadruped, probably arboreal in its habits, and an inhabitant of the Old World."

"I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection."

"The more I see of the world, the more I am convinced of the fact that it is full of wonders."