A man's praise in his own mouth stinks. 
Related proverbs
Similar proverbs in the same language
English
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Self-praise is no recommendation.
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He that praises himself spatters himself.
Similar proverbs in another language
Latin
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Non te laudabis: propria laus foetet in ore.
Thou shalt not praise thyself: one's own praise stinks in the mouth.
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Propria laus sordet.
One's own praise is dirty.
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Qui se ipsum laudat, cito derisorem inveniet.
He who praises himself will soon find a scorner.
French
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Une once de vanité gâte un quintal de mérite.
An ounce of vanity spoils a quintal of merit.
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Qui se loue, s'emboue.
Who rents, gets stuck.
German
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Eigenlob stinkt, Eigenruhm hinkt.
Self-praise stinks, self-fame limps.
Czech
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Sebechvála smrdí.
Self-praise stinks.
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Kdo sám se honosí, v hlavě mnoho nenosí.
He who boasts himself does not carry much in his head.
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Sám sobě hude, sám vesel bude.
He will be his own bull, he will be his own oar.
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Vlastní chvála z hrdla smrdí.
Self-praise stinks from the throat.