There cannot.

And there is unity where there is community of pleasures and pains — where all the citizens are glad or grieved on the same occasions of joy and sorrow?

No doubt.

Yes; and where there is no common but only private feeling a State is disorganized — when you have one half of the world triumphing and the other plunged in grief at the same events happening to the city or the citizens?

Certainly.

Such differences commonly originate in a disagreement about the use of the terms ‘mine’ and ‘not mine,’ ‘his’ and ‘not his.’

Exactly so.

And is not that the best-ordered State in which the greatest number of persons apply the terms