I mean, a lunatic acts in accordance with his own opinion of what is good; but in his case can it function as an adequate guide? ‘No.’ So let’s move beyond opinion; is there nothing better? [13] Here you have philosophy’s starting point: we find that people cannot agree among themselves, and we go in search of the source of their disagreement. In time, we come to scorn and dismiss simple opinion, and look for a way to determine if an opinion is right or wrong. At last, we focus on finding a standard that we can invoke, just as the scale was invented to measure weights, and the carpenter’s rule
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