Where do you find the strength to brave a barrage of enemy fire and to bring your wounded friends to safety at great risk to your own life? Conviction.
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.