摩訶止觀 4.67

4.67

四者當發露，莫覆瑕疵。賊毒惡草，急須除之；根露條枯，源乾流竭。若覆藏罪，是不良人。迦葉頭陀令大眾中發露；方等令向一人發露；其餘行法但以實心向佛像改革。如陰隱有癰，覆諱不治則死。以此翻破覆藏罪心也。

Fourth is to disclose and confess, not concealing flaws and blemishes. Bandits, poison, and noxious weeds must be removed urgently; when the roots are exposed the branches wither, and when the source dries up the flow ceases. If one conceals transgressions, one is an untruthful person. The dhūta Kāśyapa required disclosure amidst the great assembly; the vaipulya [repentance] requires disclosure to a single person; other ritual methods require only turning with a sincere heart to a Buddha image to reform. It is like an ulcer in a secret part of the body: if one conceals it and avoids treatment, one dies. In this way one overturns and shatters the mindset of concealing transgressions.