Let a fool hold his tongue and he will pass for a sage.
Taciturnitas stulto homini pro sapientia est.
Original text (Latin)
More quotes by Publilius Syrus
Conversation is the image of the mind; as the man, so is his speech.
Pardon one offence and you encourage the commission of many.
Attribution
Quote text and notes from Wikiquote: Publilius Syrus (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.