Gustav Le Bon, from the Introduction to his book The Crowd (1895):

“History tells us, that from the moment when the moral forces on which a civilisation rested have lost their strength, its final destruction is brought about by those unconscious and brutal crowds known, justifiably enough, as barbarians.  Civilisations as yet have only been created and directed by a small intellectual aristocracy, never by crowds…A civilisation involves fixed rules, discipline, a passing from the instinctive to the rational state, forethought for the future, an elevated degree of culture – all of them conditions that crowds, left to themselves, have invariably shown themselves incapable of realising.”