After confession he felt a great weight lifted from his heart.
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Specifically Catholic terminology. Protestants say 认罪 (rènzuì, to confess sin), while Buddhists use 忏悔 (chànhuǐ, to repent). Mainland Catholics also call the sacrament 告解圣事 (gàojiě shèngshì, the Sacrament of Confession).