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Marcus Tullius Cicero Quotes about Lying

So near is falsehood to truth that a wise man would do well not to trust himself on the narrow edge.

"Academici". Book by Marcus Tullius Cicero (Book IV, Chapter 21), translated, 45 BC.

For every man's nature is concealed with many folds of disguise, and covered as it were with various veils. His brows, his eyes, and very often his countenance, are deceitful, and his speech is most commonly a lie.

Marcus Tullius Cicero (1850). “Cicero's Three Books of Offices, or Moral Duties; also his Cato Major, an essay on Old Age; Lælius, an essay on Friendship; Paradoxes; Scipio's Dream; and Letter to Quintus on the duties of a magistrate. Literally translated, with notes ... by Cyrus R. Ed”, p.313

A liar is not believed even though he tell the truth.

"Hoyt's New Cyclopedia Of Practical Quotations" by Jehiel Keeler Hoyt, De Divinatione, II. 71, p. 485-87, 1922.