Plato: The Republic

5. BOOK V (continued)

Precisely.

Verily, Glaucon, I said, glorious is the power of the art of contradiction!

Why do you say so?

Because I think that many a man falls into the practice against his will. When he thinks that he is reasoning he is really disputing, just because he cannot define and divide, and so know that of which he is speaking; and he will pursue a merely verbal opposition in the spirit of contention and not of fair discussion.

Yes, he replied, such is very often the case; but what has that to do with us and our argument?

A great deal; for there is certainly a danger of our getting unintentionally into a verbal opposition.

In what way?

Why, we valiantly and pugnaciously insist upon the verbal truth, that different natures ought to have different pursuits, but we never considered at all what was the meaning of sameness or difference of nature, or why we distinguished them when we assigned different pursuits to different natures and the same to the same natures.

Why, no, he said, that was never considered by us.

I said: Suppose that by way of illustration we were to ask the question whether there is not an opposition in nature between bald men and hairy men; and if this is admitted by us, then, if bald men are cobblers, we should forbid the hairy men to be cobblers, and conversely?

That would be a jest, he said.

Yes, I said, a jest; and why? because we never meant when we constructed the State, that the opposition of natures should extend to every difference, but only to those differences which affected the pursuit in which the individual is engaged; we should have argued, for example, that a physician and one who is in mind a physician may be said to have the same nature.

True.