The Abolition of Man - C. S. Lewis [8]
At this point the Innovator may ask why, after all, selfishness should be more ‘rational’ or ‘intelligent’ than altruism. The question is welcome. If by Reason we mean the process actually employed by Gaius and Titius when engaged in debunking (that is, the connecting by inference of propositions, ultimately derived from sense data, with further propositions), then the answer must be that a refusal to sacrifice oneself is no more rational than a consent to do so. And no less rational. Neither choice is rational—or irrational—at all. From propositions about fact alone no practical conclusion can ever be drawn. This will preserve society cannot lead to do this except by the mediation of society ought to be preserved. This will cost you your life cannot lead directly to do not do this: it can lead to it only through a felt desire or an acknowledged duty of self-preservation. The Innovator is trying to get a conclusion in the imperative mood out of premisses in the indicative mood: and though he continues trying to all eternity he cannot succeed, for the thing is impossible. We must therefore either extend the word Reason to include what our ancestors called Practical Reason and confess that judgements such as society ought to be preserved (though they can support themselves by no reason of the sort that Gaius and Titius demand) are not mere sentiments but are rationality itself; or else we must give up at once, and for ever, the attempt to find a core of ‘rational’ value behind all the sentiments we have debunked. The Innovator will not take the first alternative, for practical principles known to all men by Reason are simply the Tao which he has set out to supersede. He is more likely to give up the quest for a ‘rational’ core and to hunt for some other ground even more ‘basic’ and ‘realistic’.
This he will probably feel that he has found in Instinct. The preservation of society, and of the species itself, are ends that do not hang on the precarious thread of Reason: they are given by Instinct. That is why there is no need to argue against the man who does not acknowledge them. We have an instinctive urge to preserve our own species. That is why men ought to work for posterity. We have no instinctive urge to keep promises or to respect individual life: that is why scruples of justice and humanity—in fact the Tao—can be properly swept away when they conflict with our real end, the preservation of the species. That, again, is why the modern situation permits and demands a new sexual morality: the old taboos served some real purpose in helping to preserve the species, but contraceptives have modified this and we can now abandon many of the taboos. For of course sexual desire, being instinctive, is to be gratified whenever it does not conflict with the preservation of the species. It looks, in fact, as if an ethics based on instinct will give the Innovator all he wants and nothing that he does not want.
In reality we have not advanced one step. I will not insist on the point that Instinct is a name for we know not what (to say that migratory birds find their way by instinct is only to say that we do not know how