On Baptism, Against the Donatists

^34. A few things still remain to be noticed in the epistle to Jubaianus; but since these will raise the question both of the past custom of the Church and of the baptism of John, which is wont to excite no small doubt in those who pay slight attention to a matter which is sufficiently obvious, seeing that those who had received the baptism of John were commanded by the apostle to be baptized again they are not to be treated in a hasty manner, and had better be reserved for another book, that the dimensions of this may not be inconveniently large.