'It it is Man's power to treat himself as a mere "natural object" and his own judgement of value as raw material for scientific manipulation to alter at will. The objection to his doing so does not lie in the fact that his point of view (like one's first day in a dissecting room) is painful and shocking till we grow used to it. The pain and the shock are at most a warning and a symptom. The real objection is that if man chooses to treat himself as a raw material, raw material he will be: not raw material to be manipulated, as he fondly imagined, by himself, but by mere appetite, that is, mere Nature, in the person of his de-humanized Conditioners.'
CS Lewis, The Abolition of Man, p.72.