William McDougall,
The Group Mind: A Sketch of the Principles of Collective Psychology
“ Many of the great events of history have been determined by ideas that have had no relation to individual welfare, but have inspired a collective enthusiasm for collective action, for national effort, of a disinterested kind; and the lives of some nations have been dominated by some one or two such ideas. These ideas are first conceived and taught by some great man, or by a few men who have acquired prestige and influence ”
