18. But it will be urged that baptism after a heretic is much more required, because John was not a heretic, and yet baptism was repeated after him. On this principle, a man may say, much more must we rebaptize after a drunkard, because John was sober, and yet baptism was repeated after him. And we shall have no answer to make to such a man, save that the baptism of Christ was given to those who were baptized by John, because they had it not; but where men have the baptism of Christ, no iniquity on their part can possibly effect that the baptism of Christ should fail to be in them.