NPNF1-04. Augustine: The Writings Against the Manichaeans and Against the Donatists

Chapter 27.—52. Also another Felix of Buslaceni¹⁸³³ said: "In admitting heretics to the Church without baptism, let no one place custom before reason and truth; for reason and truth always exclude custom."¹⁸³⁴

1. To him our answer is: You do not show the truth; you confess the existence of the custom. We should therefore do right in maintaining the custom which has since been confirmed by a plenary Council, even if the truth were still concealed, which we believe to have been already made manifest.