Of these two first parents of the human race, then, Cain was the first-born, and he belonged to the city of men; after him was born Abel, who belonged to the city of God. For as in the individual the truth of the apostle's statement is discerned, "that is not first which is spiritual, but that which is natural, and afterward that which is spiritual,"[130] whence it comes to pass that each man, being derived from a condemned stock, is first of all born of Adam evil and carnal, and becomes good and spiritual only afterwards, when he is grafted into Christ by regeneration: so was it in the human race as a whole. When these two cities began to run their course by a series of deaths and births, the citizen of this world was the first-born, and after him the stranger in this world, the citizen of the city of God, predestinated by grace, elected by grace, by grace a stranger below, and by grace a citizen above. By grace,--for so far as regards himself he is sprung from the same mass, all of which is condemned in its origin; but God, like a potter (for this comparison is introduced by the apostle judiciously, and not without thought), of the same lump made one vessel to honour, another to dishonour.[131] But first the vessel to dishonour was made, and after it another to honour. For in each individual, as I have already said, there is first of all that which is reprobate, that from which we must begin, but in which we need not necessarily remain; afterwards is that which is well-approved, to which we may by advancing attain, and in which, when we have reached it, we may abide. Not, indeed, that every wicked man shall be good, but that no one will be good who was not first of all wicked; but the sooner any one becomes a good man, the more speedily does he receive this title, and abolish the old name in the new. Accordingly, it is recorded of Cain that he built a city,[132] but Abel, being a sojourner, built none. For the city of the saints is above, although here below it begets citizens, in whom it sojourns till the time of its reign arrives, when it shall gather together all in the day of the resurrection; and then shall the promised kingdom be given to them, in which they shall reign with their Prince, the King of the ages, time without end. 2. _Of the children of the flesh and the children of the promise._