A liar is not believed when he speaks the truth. 
Proverbs on a similar topic
- All that glitters is not gold.
- Still waters run deep.
- There is truth in wine.
- None so deaf as those who will not hear.
- Many a true word is spoken in jest.
- A fair face may hide a foul heart.
- Iron hand in a velvet glove.
- Barking dogs seldom bite.
- Lies have short legs.
- Truth is mighty and will prevail.
- Appearances are deceptive.
- A honey tongue, a heart of gall.
- The cowl does not make the monk.
- The biter bit.
- The face is no index to the heart.
- All are not thieves that dogs bark at.
- Children and fools tell the truth.
- A little body often harbours a great soul.
- All are not hunters that blow the horn.
- It is not the gay coat that makes the gentleman.
- When candles are out, all cats are grey.
- All are good lasses, but whence come the bad wives?
- A traveller may lie with authority.
- Great boast and small roast.
- You cannot hide an eel in a sack.
- Liars have need of good memories.
- Truth has a scratched face.
- Fair without, false within.
Related proverbs
Similar proverbs in the same language
English
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He that once deceives, is ever suspected.
Similar proverbs in another language
Latin
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Mendaci homini, ne verum quidem dicenti, credere solemus.
We tend to believe a man who is a liar, who does not even tell the truth.
French
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Un menteur n'est point écouté même en disant la vérité.
A liar is not listened to even if he is telling the truth.
-
Ne crois pas un menteur même quand il dit la vérité.
Don't believe a liar even when he's telling the truth.
German
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Wer einmal lügt, dem glaubt man nicht, und wenn er auch die Wahrheit spricht.
He who lies once is not believed, even if he speaks the truth.
Czech
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Kdo včera lhal, tomu i zítra se nevěří.
He who lied yesterday is not to be trusted tomorrow.