12 I also will put questions; let us meanwhile lay aside the inquiry as to whom this was said, “My dove is one, the only one of her mother;”— as yet we are inquiring—it was said either to me or to you; let us postpone the question as to whom it was said. This is what I ask, if the dove is simple, innocent, without gall, peaceful in its kisses, not fierce with its talons, I ask whether the covetous, the rapacious, the crafty, the sottish, the infamous, belong to the members of this dove?
Are they members of this dove? Far be the thought, says he. And who would really say this, brethren? To speak of nothing else, if I mention the rapacious alone, members of the hawk they may be, not members of the dove. Kites seize and plunder, so do hawks, so do ravens; doves do not plunder nor tear, consequently they who snatch and rob are not members of the dove. Was there not even one rapacious person among you? Why abides the baptism, which in this case the hawk, not the dove, has given?
Why do you not among yourselves baptize after robbers, after adulterers, after drunkards? Why not baptize after the avaricious among yourselves? Are these all members of the dove? You so dishonor your dove that you make those that have the nature of the vulture her members. What, then, brethren, what say we? There are the bad and the good in the Catholic Church, but with them the bad only. But perhaps I say this with a hostile feeling: let this too be afterwards examined. They do say, certainly, that among them are the good and the bad; for, should they assert that they have only the good, let their own credit it, and I subscribe.
With us, let them say, there are none but holy, righteous, chaste, sober men; no adulterers, no usurers, no deceivers, no false swearers, no wine-bibbers;— let them say this, for I heed not their tongues, I touch their hearts. But since they are well known to us, and to you, and to their own, just as you are known both to yourselves in the Catholic Church and to them, neither let us find fault with them, nor let them flatter themselves. We confess that in the Church there are good and bad, yet as the grain and the chaff.
Sometimes he who is baptized by the grain is chaff, and he who is baptized by the chaff is grain. Otherwise, if his baptism who is baptized by the grain stands good, and his who is baptized by the chaff not, then it is not true, “This is He that baptizes.” But if it is true “This is He that baptizes,” then what is given by the chaff stands good, and he baptizes in like manner as the dove. For the bad man (who administers baptism) is not the dove, nor belongs to the members of the dove, nor can he possibly be affirmed to be so, either with us in the Catholic Church or with them, if they assert that their Church is the dove.
What then are we to understand, brethren? Since it is evident, and known to all, and they must admit, though it be against their will, that when with them bad men give baptism, it is not given after those bad men; and with us, too, when the bad give baptism, it is not given after them. The dove does not baptize after the raven; why then would the raven baptize after the dove?
Source: Tractates on the Gospel of John (New Advent)