The Republic by Plato
The Republic by Plato But, said Cleitophon, he meant by the interest of the stronger what the stronger thought to be his interest,—this was what the weaker had to do; and this was affirmed by him to be justice.
Those were not his words, rejoined Polemarchus.
Never mind, I replied, if he now says that they are, let us accept his statement. Tell me, Thrasymachus, I said, did you mean by justice what the stronger thought to be his interest, whether really so or not?
Certainly not, he said. Do you suppose that I call him who is mistaken the stronger at the time when he is mistaken?
Yes, I said, my impression was that you did so, when you admitted that the ruler was not infallible but might be sometimes mistaken.