Plato: The Republic

1. BOOK I (continued)

Very true, he said: and I think that we had better correct an error into which we seem to have fallen in the use of the words `friend' and `enemy.'

What was the error, Polemarchus? I asked.

We assumed that he is a friend who seems to be or who is thought good.

And how is the error to be corrected?

We should rather say that he is a friend who is, as well as seems, good; and that he who seems only, and is not good, only seems to be and is not a friend; and of an enemy the same may be said.

You would argue that the good are our friends and the bad our enemies?

Yes.

And instead of saying simply as we did at first, that it is just to do good to our friends and harm to our enemies, we should further say: It is just to do good to our friends when they are good and harm to our enemies when they are evil?

Yes, that appears to me to be the truth.

But ought the just to injure any one at all?

Undoubtedly he ought to injure those who are both wicked and his enemies.

When horses are injured, are they improved or deteriorated?

The latter.

Deteriorated, that is to say, in the good qualities of horses, not of dogs?

Yes, of horses.

And dogs are deteriorated in the good qualities of dogs, and not of horses?

Of course.

And will not men who are injured be deteriorated in that which is the proper virtue of man?