The existence of this tendency to aggression which we can detect in ourselves and rightly presume to be present in others is the factor that disturbs our relations with our neighbours and makes it necessary for culture to institute its high demands. Civilized society is perpetually menaced with disintegration through this primary hostility of men towards one another. Their interests in their common work would not hold them together; the passions of instinct are stronger than reasoned interests. Culture has to call up every possible reinforcement in order to erect barriers against the aggressive instincts of men and hold their manifestations in check by reaction-formations in men’s minds. Hence its system of methods by which mankind is to be driven to identifications and aim-inhibited love-relationships; hence the restrictions on sexual life; and hence, too, its ideal command to love one’s neighbour as oneself, which is really justified by the fact that nothing is so completely at variance with original human nature as this. With all its striving, this endeavour of culture’s has so far not achieved very much. Civilization expects to prevent the worst atrocities of brutal violence by taking upon itself the right to employ violence against criminals, but the law is not able to lay hands on the more discreet and subtle forms in which human aggressions are expressed. The time comes when every one of us has to abandon the illusory anticipations with which in our youth we regarded our fellow-men, and when we realize how much hardship and suffering we have been caused in life through their ill-will. It would be unfair, however, to reproach culture with trying to eliminate all disputes and competition from human concerns. These things are undoubtedly indispensable; but opposition is not necessarily enmity, only it may be misused to make an opening for it.