This is the metaphysical scaffolding—we may if we like choose to dispense with it—by aid of which Jules de Gaultier erects his spectacular conception of the world. He is by no means concerned to deny the necessity of morality. On the contrary, morality is the necessary restraint on the necessary biological instinct of possession, on the desire, that is, by the acquisition of certain objects, to satisfy passions which are most often only the exaggeration of natural needs, but which—through the power of imagination such exaggeration inaugurates in the world—lead to the development of civilisation. Limited and definite so long as confined to their biological ends, needs are indefinitely elastic, exhibiting, indeed, an almost hysterical character which becomes insatiable. They mark a hypertrophy of the possessive instinct which experience shows to be a menace to social life. Thus the Great War of recent times may be regarded as the final tragic result of the excessive development through half a century of an economic fever, the activity of needs beyond their due biological ends producing suddenly the inevitable result.[145] So that the possessive instinct, while it is the cause of the formation of an economic civilised society, when pushed too far becomes the cause of the ruin of that society. Man, who begins by acquiring just enough force to compel Nature to supply his bare needs, himself becomes, according to the tragic Greek saying, the greatest force of Nature. Yet the fact that a civilisation may persist for centuries shows that men in societies have found methods of combating the exaggerated development of the possessive instinct, of retaining it within bounds which have enabled societies to enjoy a fairly long life. These methods become embodied in religions and moralities and laws. They react in concert to restrain the greediness engendered by the possessive instinct. They make virtues of Temperance and Sobriety and Abnegation. They invent Great Images which arouse human hopes and human fears. They prescribe imperatives, with sanctions, in part imposed by the Great Images and in part by the actual executive force of social law. So societies are enabled to immunise themselves against the ravaging auto-intoxication of an excessive instinct of possession, and the services rendered by religions and moralities cannot be too highly estimated. They are the spontaneous physiological processes which counteract disease before medical science comes into play.