Musar על חולין 88:37

If a man has committed transgressions for which he is liable to be cut off from among his people or to be condemned to death by the court, then repentance and the Day of Atonement atone for half of his sin, while afflictions that come upon him atone for half. "But if he has been guilty of the profanation of the Name, then penitence has no power to suspend punishment, nor the day of Atonement to procure atonement, nor suffering to finish it, but all of them together suspend the punishment and only death finishes it" (Yoma 86a, and see T.P. Yoma 8:8). Therefore, a man should guard himself exceedingly from profaning the Name of God, and he should keep away from ugly conduct and from that which resembles it. And the principal requirement in repenting for profaning the Name of God is that he should make known his sins in the presence of many, and he should say, "Do not learn from me, for in my folly I have sinned, I have perverted, I have trespassed, I have profaned the Name of God, Blessed be He." And he should keep many fasts and he should confess every day until the day of his death.