There is, I conceive, no contradiction in believing that mind is at once the cause of matter and of the development of individualised human minds through the agency of matter
Alfred Russel WallaceTruth is born into this world only with pangs and tribulations, and every fresh truth is received unwillingly.
Alfred Russel WallaceMars, therefore, is not only uninhabited by intelligent beings such as Mr. Lowell postulates, but is absolutely uninhabitable.
Alfred Russel Wallace