Our surmises regarding the subtle functions of neural processes within the brain are profoundly constrained by the fact that the brain did not evolve in order to understand itself. The complex organization of the brain evolved as a consequence of our sensorial and muscled engagement with the landscapes that surround us.
The question “What is man?” is probably the most profound that can be asked by man. It has always been central to any system of philosophy or theology…. The point I want to make now is that all attempts to answer that question before 1859 are worthless and that we will be better off if we ignore them completely.
Readers of Darwin's life, for instance, and particularly of the published correspondence of Darwin, are henceforth naturalists in the making. Ever afterwards they are Darwins on a small scale, seeing animals and plants in an entirely different light and with a correspondingly keener interest.
When you talk with people, one of the arguments they'll throw back at you is that the climate has always changed, and that is absolutely right. It's the rate of change that is the problem right now. It's changing so quickly that it exceeds the adaptive capacity of some species.
The evolution of higher and of lower forms of life is as well and as soundly established as the eternal hills. It has long since ceased to be a theory; it is a law of Nature as universal in living things as is the law of gravitation in material things and in the motions of the heavenly spheres.
Today the earth speaks with resonance and clearness and every ear in every civilized country of the world is attuned to its wonderful message of the creative evolution of man, except the ear of William Jennings Bryan; he alone remains stone-deaf, he alone by his own resounding voice drowns the eternal speech of nature.