Ambrosiaster — on Rom 2:16 (COMMENTARY ON PAUL'S EPISTLES)

“There are two thoughughts inside a man which will accuse each other—the good and the evil. The good accuses the evil because it has denied the truth. The evil accuses the good because it has not done what it knows to be right. One who knows that the church is good and true but persists in heresy or schism will be judged guilty. Other thoughts will excuse, insofar as one has done what is expedient to do. He will say inwardly: "In my mind I have always thought it expedient to do what I have done. This was my faith." He will have a better case, even though he will still have to be corrected, because his conscience will not accuse him on the day of judgment. This is how the secret things of men will be judged by Jesus Christ our Lord on the day of judgment.”