And has each of them a distinct function like the parts of the face;—the eye, for example, is not like the ear, and has not the same functions; and the other parts are none of them like one another, either in their functions, or in any other way? I want to know whether the comparison holds concerning the parts of virtue. Do they also differ from one another in themselves and in their functions? For that is clearly what the simile would imply.
Yes, Socrates, you are right in supposing that they differ.
Then, I said, no other part of virtue is like knowledge, or like justice, or like courage, or like temperance, or like holiness?
No, he answered.
Well then, I said, suppose that you and I enquire into their natures. And first, you would agree with me that justice is of the nature of a thing, would you not? That is my opinion: would it not be yours also?
Mine also, he said.
And suppose that some one were to ask us, saying, 'O Protagoras, and you, Socrates, what about this thing which you were calling justice, is it just or unjust?'—and I were to answer, just: would you vote with me or against me?
With you, he said.
Thereupon I should answer to him who asked me, that justice is of the nature of the just: would not you?
Yes, he said.