The Republic by Plato Part 5 Page 29

pursuits in common; to the utility and also to the possibility of this arrangement the consistency of the argument with itself bears witness.

Yes, that was a mighty wave which you have escaped.

Yes, I said, but a greater is coming; you will not think much of this when you see the next.

Go on; let me see.

The law, I said, which is the sequel of this and of all that has preceded, is to the following effect, — ’that the wives of our guardians are to be common, and their children are to be common, and no parent is to know his own child, nor any child his parent.’

Yes, he said, that is a much greater wave than the other; and the possibility as well as the utility of such a law are far more questionable.