“A man who works under orders with other men must be without vanity. If he has too strong a will of his own and if his ideas are in conflict with those of his chief, the execution of orders will always be uncertain because of his efforts to interpret them in his own way. Faith in the chief must keep the gang together. Obviously deference must not turn into servility. A chief of staff or a departmental head should be able, if it seems to him (rightly or wrongly) that his superior is making a serious mistake, to tell him so courageously. But this sort of collaboration is really effective only if such frankness has true admiration and devotion behind it. If the lieutenant does not admit that his chief is more experienced and has better judgment than he himself, he will serve him badly. Criticism of the chief by a subordinate must be accidental and not habitual. What must an assistant do if he is sure he is right and if his chief refuses to accept his criticisms? He must obey the order after offering his objections. No collective work is possible without discipline. If the matter is so serious that it can have a permanent effect upon the future of a country, an army, or a commercial enterprise, the critic may hand in his resignation. But this must be done only as a last resort; as long as a man thinks he can be useful he must remain at his post.”

Un Art de Vivre (The Art of Living) (1939), The Art of Working