18 Likewise another Felix of Marazana said: "There is one faith, one baptism, but of the Catholic Church, to which alone is given authority to baptize."
19. What if another were to say as follows: One faith, one baptism, but of the righteous only, to whom alone authority is given to baptize? As these words might be refuted, so also may the judgment of Felix be refuted. Do even the unrighteous who are not changed in heart in baptism, while "they renounce the world in words and not in deeds" yet belong to the members of the Church? Let them consider whether such a Church is the actual rock, the very dove, the bride herself without spot or wrinkle.
Source: On Baptism, Against the Donatists (New Advent)