If a weakly mortal is to do anything in the world besides eat the bread thereof there must be a determined subordination of the whole nature to the one aim no trifling with time which is passing with strength which is only too limited.
You can manage 50 people through the strength of your personality and lack of sleep. You can touch them all in a week and make sure they're all pointed in the right direction.
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This is just what I have thought when I have seen slaves at work – they seem to go through the motions of labor without putting strength into them. They keep their powers in reserve for their own use at night perhaps.