In vino veritas is a Latin proverb that means “in wine there is truth.”
The phrase is often continued as “In vino veritas, in aqua sanitas”: “In wine there is truth, in water health.” Pliny the Elder’s Naturalis Historia contains an early allusion to the phrase and the same expression is also found in Erasmus Adagia.
Herodotus in his Histories, Book 1, asserted that if the Persians decided something while drunk, they made a rule to reconsider it when sober. Later other authors also added that if the Persians made a decision while sober, they made a rule to reconsider it when they were drunk.
During Roman times, to prevent participants from concealing facts, the historian Tacitus described how Germanic peoples would get drunk during council.
Similar phrases with similar meanings exist across different cultures and languages all over the world.