Therefore, there is no need for us, in our consideration of the basic attribute of the soul which we call conscience, to tease ourselves with the fabulous image of some prehistoric "cave-man" supposedly devoid of such a sense. To do this is to employ a trick of the isolated reason quite alien from our real human imagination. Our own personality is so constructed that it is impossible for us to realize with any sort of intelligent sympathy what the feelings of this conscience-less cave-man would be. To contemplate his existence at all we have to resort to pure rationalistic speculation. We have to leave our actual human experience completely behind. But the philosophy of the complex vision is an attempt to interpret the mystery of the universe in terms of nothing else than actual human experience. So we are not only permitted but compelled to put out of court this conscience-less cave-man of pure speculation. It is true that we encounter certain eccentric human beings who deny that they possess this "moral sense"; but one has only to observe them for a little while under the pressure of actual life to find out how they deceive themselves. Experience certainly indicates that every human being, however normal and "good," has somewhere in him a touch of insanity and a vein of anti-social aberration. But no human being, however abnormal or however "criminal," is born into the world without this invisible monitor we call "conscience." The curious pathological experience which might be called "conscience-killing" is certainly not uncommon. But it is an experiment that has never been more than approximately successful. In precisely the same way we might practise "reason-killing" or "intuition-killing" or "taste-killing." One may set out to hunt and try to kill any basic attribute of our complex vision; but the proof of the truth of our whole argument lies in the fact that these murderous campaigns are never completely successful. The "murdered" attribute refuses to remain quiet in its grave. It stretches out an arm from beneath the earth. It shakes the dust off and comes to life again. When we leave the question as to the existence of conscience, and enquire what the precise and particular "command" of conscience may be in any individual case, we approach the edge of an altogether different problem. The particular message or command of conscience is bound to differ in a thousand ways in the cases of different personalities. Only in its ultimate essence it cannot differ. Because, in its ultimate essence, the conscience of every individual is confronted by that eternal duality of love and malice which is the universal contradiction at the basis of every living soul.