there is nothing but advantage, and by rights what should happen is that the strongest people should get the best rewards. But why think the strongest people should get more than the weak? In fact, how can the sophists even use the word “should” if they reject absolute morality? Here the sophists could turn to a distinction they liked to draw between custom and nature. It is only by custom that there are social rules and laws of justice, and these laws may or may not reflect the natural order of things. It’s natural for the strong to dominate the weak, whereas it’s a mere custom for the weak
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