The average normal civilized human being witnesses aggression only when two of his fellow citizens or two of his domestic animals fight, and therefore sees only its evil effects. Innate behavior mechanisms can be thrown completely out of balance by small, apparently insignificant changes of environmental conditions. Inability to adapt quickly to such changes may bring about the destruction of a species, and the changes which man has wrought in his environment are by no means insignificant. Freud showed that lack of social contact, and above all deprivation of it, were among the factors strongly predisposing to facilitate aggression. All the great dangers threatening humanity with extinction are direct consequences of conceptual thought and verbal speech. They drove man out of the paradise in which he could follow his instincts with impunity and do or not do whatever he pleased.