know; but there is no doubt about the accuracy of this conclusion.[12] Now, we have seen that order and cleanliness are essentially cultural demands, although the necessity of them for survival is not particularly apparent, any more than their suitability as sources of pleasure. At this point we must be struck for the first time with the similarity between the process of cultural development and that of the libidinal development in an individual. Other instincts have to be induced to change the conditions of their gratification, to find it along other paths, a process which is usually identical with what we know so well as sublimation (of the aim of an instinct), but which can sometimes be differentiated from this. Sublimation of instinct is an especially conspicuous feature of cultural evolution; this it is that makes it possible for the higher mental operations, scientific, artistic, ideological activities, to play such an important part in civilized life. If one were to yield to a first impression, one would be tempted to say that sublimation is a fate which has been forced upon instincts by culture alone. But it is better to reflect over this a while longer. Thirdly and lastly, and this seems most important of all, it is impossible to ignore the extent to which civilization is built up on renunciation of instinctual gratifications, the degree to which the existence of civilization presupposes the non-gratification (suppression, repression or something else?) of powerful instinctual urgencies. This ‘cultural privation’ dominates the whole field of social relations between human beings; we know already that it is the cause of the antagonism against which all civilization has to fight. It sets hard tasks for our scientific work, too; we have a great deal to explain here. It is not easy to understand how it can become possible to withhold satisfaction from an instinct. Nor is it by any means without risk to do so; if the deprivation is not made good economically, one may be certain of producing serious disorders. But now, if we wish to know what use it is to us to have recognized the evolution of culture as a special process, comparable to the normal growth of an individual to maturity, we must clearly attack another problem and put the question: what are the influences to which the evolution of culture owes its origin, how did it arise and what determined its course? FOOTNOTES: [10] Cf. _The Future of an Illusion_.