Chap. X.—13. But they think within themselves that they show very great subtlety in asking whether the baptism of Christ in the party of Donatus makes men sons or not; so that, if we allow that it does make them sons, they may assert that theirs is the Church, the mother which could give birth to sons in the baptism of Christ; and since the Church must be one, they may allege that ours is no Church. But if we say that it does not make them sons, "Why then," say they, "do you not cause those who pass from us to you to be born again in baptism, after they have been baptized with us, if they are not thereby born as yet?"