It is impossible for our working people to maintain their full strength if they do not succeed in obtaining a sufficient supply of fat allotted to them on a proper basis.
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.