The Just Is the Good, and the Evil Is the Enemy

Polymarcus: It is just to do good to our friends when they are good men, harm our enemies when they are evil. But ought the just to injure any one at all? Undoubtedly he ought to in those who are both wicked and his enemies. When horses are injured, are they improved or deteriorated? The latter, deteriorated in the good qualities of horses, not of dogs. And can the just, by justice, make men unjust? Assuredly not. Or speaking generally, can the good, by virtue, them bad? Clearly not. Nor can the good harm any one. So i think that we had better correct an error into which we seem to have fallen in