To be imbued with a sense of the spirit and nature of this business, to make use of, to rouse, to assimilate into the system the powers which should … - Carl von Clausewitz

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To be imbued with a sense of the spirit and nature of this business, to make use of, to rouse, to assimilate into the system the powers which should be active in it, to penetrate completely into the nature of the business with the understanding, through exercise to gain confidence and expertness in it, to be completely given up to it, to pass out of the man into the part which it is assigned to us to play in War, that is the military virtue of an Army in the individual.