"For though the good person have a good conscience, how does he know how the final judge, who is deceived by no one, will judge? He has a good conscience; no sins conceived in the heart argue with him. Yet, though his conscience is good, because of the daily sins of human life, he says to God daily, 'Forgive us our debts,' on the assumption that he has already done what comes next, 'as we also forgive our debtors.' He has broken his bread to the hungry from the heart; from the heart he has clothed the naked. Out of that inward oil he has done good works, and yet in that judgment even his good conscience trembles."
- St. Augustine (Sermon 93:8-9 cited in ACCS: Matthew 14-28, 219)