But because there are all these social forces making for the repression of instincts, it does not mean that these latter therefore disappear. If any one of them is unduly repressed, it does not simply vanish as a driving force in human behavior. It will make its enduring presence felt in roundabout ways, or in sudden extreme and violent outbursts. Or, if it cannot find even such sporadic or fruitive fulfillments, "a balked disposition" will leave the individual with an uneasiness and irritation that may range from mere pique to serious forms of morbidity and hysteria. A man may for eight or ten hours be kept repeating the same operation at a machine in a factory. He may thereby repress those native desires for companionship and for variety of reaction which constitute his biological inheritance. But too often postponed satisfaction takes the violent form of lurid, over-exciting amusements and dissipation. The suppression of the sex instinct not infrequently results in a morbid pruriency in matters of sex, a distortion of all other interests and activities by a preoccupation with the frustrated sex motive. Assaults and lynchings, and the whole calendar of crimes of violence with which our criminal courts are crowded, are frequent evidence of the incompleteness with which man's strong primary instincts have been suppressed by the niceties of civilization. The phenomenal outburst of collective vivacity and exuberance which marked the reported signing of the armistice at the close of the Great War was a striking instance of those immense primitive energies which the control and discipline of civilization cannot altogether repress. There has been, furthermore, a great deal of evidence adduced in recent years by students of abnormal psychology concerning the results of the frustration of native desires. When the individual is "balked" in respect to particular impulses or desires, these may take furtive and obscure fulfillments; they may play serious though obscure and unnoticed havoc with a man's whole mental life. Unfulfilled desires may give rise to various forms of "complex," distortions of thought, action, and emotion of which the individual himself may be unaware. They may make a man unduly sensitive, or fearful, or pugnacious. He may, for example, cover up a sense of mortification at failure by an unwarranted degree of bluster and brag. A particular baffling of desire may be compensated by a bitterness against the whole universe or by a melancholy of whose origin the victim may be quite unconscious. These maladjustments between an individual's desires and his satisfactions are certainly responsible for a considerable degree of that irritation and neurasthenia which are so frequently observable in normal individuals.[1]