In 1838, shortly after he had conceived the principle of natural selection,Darwin wrote in his N Notebook that ” to study Metaphysics, as they have always been studied, appears to me to be like puzzling at astronomy without mechanics. Experience shows that the problem of the mind cannot be solved by attacking the citadel itself.”
It certainly seemed to follow.The mind cannot understand its own workings and ultimate meaning merely by thinking about itself. If truly material in origin, the citadel is not to be entered directly but roundabout, through the exploration of the brain.The brain must lose some of its magic when it is regarded as a product of evolution through natural selection, like other organs of the body. So Darwin wrote in his 1838 M Notebook: “Origin of man now proved. Metaphysics must flourish. He who understands baboon would do more toward metaphysics than Locke.
— Edward O. Wilson - Biophilia