From the dawn of civilisation onwards crowds have always undergone the influence of illusions. It is to the creators of illusions that they have raised more temples, statues, and altars than to any other class of men. Whether it be the religious illusions of the past or the philosophic and social illusions of the present, these formidable sovereign powers are always found at the head of all the civilisations that have successively flourished on our planet. It is in their name that were built the temples of Chaldea and Egypt and the religious edifices of the Middle Ages, and that a vast upheaval shook the whole of Europe a century ago, and there is not one of our political, artistic, or social conceptions that is free from their powerful impress. Occasionally, at the cost of terrible disturbances, man overthrows them, but he seems condemned to always set them up again. Without them he would never have emerged from his primitive barbarian state, and without them again he would soon return to it. Doubtless they are futile shadows; but these children of our dreams have forced the nations to create whatever the arts may boast of splendour or civilisation of greatness. "If one destroyed in museums and libraries, if one hurled down on the flagstones before the churches all the works and all the monuments of art that religions have inspired, what would remain of the great dreams of humanity? To give to men that portion of hope and illusion without which they cannot live, such is the reason for the existence of gods, heroes, and poets. During fifty years science appeared to undertake this task. But science has been compromised in hearts hungering after the ideal, because it does not dare to be lavish enough of promises, because it cannot lie."[14] [14] Daniel Lesueur. The philosophers of the last century devoted themselves with fervour to the destruction of the religious, political, and social illusions on which our forefathers had lived for a long tale of centuries. By destroying them they have dried up the springs of hope and resignation. Behind the immolated chimeras they came face to face with the blind and silent forces of nature, which are inexorable to weakness and ignore pity.