Tradition
St. Augustine
Answer to Letters of Petilian, Bishop of Cirta
Book II › Chapter 60
135. Petilianus said: "Under what law, then, do you make out that you are Christians, seeing that you do what is contrary to the law?"
136. Augustine answered: You are anxious for strife, and not for argument.
Source: Answer to Letters of Petilian, Bishop of Cirta (New Advent)