...As regards contraceptives, there is a paradoxical, negative sense in which all possible future generations are the patients or subjects of a power wielded by those already alive. By contraception simply, they are denied existence; by contraception used as a means of selective breeding, they are, without their concurring voice, made to be what one generation, for its own reasons, may choose to prefer. From this point of view, what we call Man's power over Nature turns out to be a power exercised by some men over other men with Nature as its instrument...(C.S. Lewis, The Abolition of Man, New York: Macmillan, 1947)
