"Always work hard. Intensity clarifies. It creates not only momentum, but also the pressure you need to feel either friction, or fulfillment."

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Everything in war is very simple, but the simplest thing is difficult. The difficulties accumulate and end by producing a kind of friction that is inconceivable unless one has experienced war. ... Countless minor incidents - the kind you can never really foresee - combine to lower the general level of performance, so that one always falls short of the intended goal.

— Carl von Clausewitz