Children and fools speak the truth.

Meaning: Unguarded honesty emerges from those lacking social filters or awareness of consequences.

Origin: From 'A Dictionary of English Proverbs and Proverbial Phrases' (1870). Public domain.

Translations

Spanish: Los niños y los locos dicen la verdad (literally: Children and fools speak the truth)

Children should hear, see, and say nothing. — Children benefit from observing and learning quietly before contributing their own opinio…
They talk of Christmas so long that it comes. — Repeated anticipation and discussion of an event eventually brings its arrival into reali…
Civil words cost nothing, and go a long way. — Courtesy requires no expense yet yields disproportionate social rewards and influence.
A close mouth catcheth no flies. — Silence protects you from inadvertently spreading rumors, revealing secrets, or inviting…
Tell me what company you keep, and I will tell you who you are. — Your character reflects your chosen associates; select companions who embody your aspirat…
Tell that tale to a deaf man. — Wasting effort communicating with someone unwilling or unable to listen yields nothing.

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