Let us suppose that each individual were required to busy himself with providing his own sustenance, clothing, dwelling-place and weapons, first acquiring the tools of carpentry and the smith’s trade, then readying thereby tools and implements for sowing and reaping, grinding and kneading, spinning and weaving … Clearly, he would not be capable of doing justice to any one of them. But when men render aid to each other, each one performing one of these important tasks that are beyond the measure of his own capacity, and observing the law of justice in transactions by giving greatly and
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