Opinions, on the other hand, which are acquired as the result of experience alone do not possess this quality of primary certitude. They are true in the sense of being verifiable, but they are unaccompanied by that profound feeling of truth which belief possesses, and, therefore, we have no sense of reluctance in admitting inquiry into them. That heavy bodies tend to fall to the earth and that fire burns fingers are truths verifiable and verified every day, but we do not hold them with impassioned certitude, and we do not resent or resist inquiry into their basis; whereas in such a question as that of the survival of death by human personality we hold the favourable or the adverse view with a quality of feeling entirely different, and of such a kind that inquiry into the matter is looked upon as disreputable by orthodox science and as wicked by orthodox religion. In relation to this subject, it may be remarked, we often see it very interestingly shown that the holders of two diametrically opposed opinions, one of which is certainly right, may both show by their attitude that the belief is held {45} instinctively and non-rationally, as, for example, when an atheist and a Christian unite in repudiating inquiry into the existence of the soul. A third practical corollary of a recognition of the true gregariousness of man is the very obvious one that it is not by any means necessary that suggestion should always act on the side of unreason. The despair of the reformer has always been the irrationality of man, and latterly some have come to regard the future as hopeless until we can breed a rational species. Now, the trouble is not irrationality, not a definite preference for unreason, but suggestibility—that is, a capacity for accepting reason or unreason if it comes from the proper source. This quality we have seen to be a direct consequence of the social habit, of a single definite instinct, that of gregariousness, the same instinct which makes social life at all possible and altruism a reality. It does not seem to have been fully understood that if you attack suggestibility by selection—and that is what you do if you breed for rationality—you are attacking gregariousness, for there is at present no adequate evidence that the gregarious instinct is other than a simple character and one which cannot be split up by the breeder. If, then, such an effort in breeding were successful, we should exchange the manageable unreason of man for the inhuman rationality of the tiger.