If the state cannot be entirely composed of good men, and yet each citizen is expected to do his own business well, and must therefore have virtue, still inasmuch as all the citizens cannot be alike, the virtue of the citizen and of the good man cannot coincide. All must have the virtue of the good citizen - thus, and thus only, can the state be perfect; but they will not have the virtue of a good man, unless we assume that in the good state all the citizens must be good.
Christianity taught the capacity, the element, to love the All-perfect without a stingy bargain for personal happiness. It taught that to love Him was happiness;--to love Him in others' virtues.
Perfect life is a contradiction in terms. Therefore we must always expect to find things not up to our highest ideal. Knowing this, we are bound to make the best of everything.