Men can usefully undertake and properly accomplish a common task only when one of them continually directs the activities of all towards the same end. This is self-evident when actions which must follow a rhythm are involved. It would be useless for a gang of men laying rails or a rowing-crew to exert themselves if a foreman or coxswain did not control their movements. Every non-directed collective action turns rapidly into confusion and disorder. All who have fought in a battle know how necessary it is that someone should be in command; and what is true of the army is true of the dockyard, the factory, the newspaper office, the whole country. Whenever men are required to act together, there must be a chief.

Un Art de Vivre (The Art of Living) (1939) - The Art of Leadership