Just as little can you guess how intimate a connection this initial boldness of psychoanalysis has with the one which follows. The next assertion which psychoanalysis proclaims as one of its discoveries, affirms that those instinctive impulses which one can only call sexual in the narrower as well as in the wider sense, play an uncommonly large role in the causation of nervous and mental diseases, and that those impulses are a causation which has never been adequately appreciated. Nay, indeed, psychoanalysis claims that these same sexual impulses have made contributions whose value cannot be overestimated to the highest cultural, artistic and social achievements of the human mind. According to my experience, the aversion to this conclusion of psychoanalysis is the most significant source of the opposition which it encounters. Would you like to know how we explain this fact? We believe that civilization was forged by the driving force of vital necessity, at the cost of instinct-satisfaction, and that the process is to a large extent constantly repeated anew, since each individual who newly enters the human community repeats the sacrifices of his instinct-satisfaction for the sake of the common good. Among the instinctive forces thus utilized, the sexual impulses play a significant role. They are thereby sublimated, i.e., they are diverted from their sexual goals and directed to ends socially higher and no longer sexual. But this result is unstable. The sexual instincts are poorly tamed. Each individual who wishes to ally himself with the achievements of civilization is exposed to the danger of having his sexual instincts rebel against this sublimation. Society can conceive of no more serious menace to its civilization than would arise through the satisfying of the sexual instincts by their redirection toward their original goals. Society, therefore, does not relish being reminded of this ticklish spot in its origin; it has no interest in having the strength of the sexual instincts recognized and the meaning of the sexual life to the individual clearly delineated. On the contrary, society has taken the course of diverting attention from this whole field. This is the reason why society will not tolerate the above-mentioned results of psychoanalytic research, and would prefer to brand it as aesthetically offensive and morally objectionable or dangerous. Since, however, one cannot attack an ostensibly objective result of scientific inquiry with such objections, the criticism must be translated to an intellectual level if it is to be voiced. But it is a predisposition of human nature to consider an unpleasant idea untrue, and then it is easy to find arguments against it. Society thus brands what is unpleasant as untrue, denying the conclusions of psychoanalysis with logical and pertinent arguments. These arguments originate from affective sources, however, and society holds to these prejudices against all attempts at refutation.