A sin that's hidden is half forgiven.
Peccato celato e mezzo perdonato.
Original text (Italian)
Notes from Wikiquote
Sin concealed is half pardoned (tr. Harbottle and Dalbiac)
Original text (Italian)
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Quote text and notes from Wikiquote: Giovanni Boccaccio (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.