We know already in principle how such things are produced: soon we shall know in detail: eventually we shall be able to produce them at will. Of course, while we did not know how minds were made, we accepted this mental furniture as a datum, even as a master. But many things in nature which were once our masters have become our servants. Why not this? Why must our conquest of nature stop short, in stupid reverence, before this final and toughest bit of ‘nature’ which has hitherto been called the conscience of man? You threaten us with some obscure disaster if we step outside it: but we have
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