[Darwin's] triumph has won for us a common height from which we see the whole world of living beings as well as all inorganic nature; phenomena of every order we now regard as expressions of natural causes. The supernatural has no longer a standing is science; it has vanished like a dream, and the halls consecrated to its thraldom of the intellect are becoming radiant with a more cheerful faith.

lecture at Clark University, "A study in evolution, based on color-characters in pigeons, and bearing on moot questions" (1909), quoted in Eight Little Piggies (W.W. Norton, 1993) by Stephen Jay Gould, page 366