What the heart thinks, the tongue speaks. 
Proverbs on a similar topic
Related proverbs
Similar proverbs in the same language
English
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The tongue ever turns to the aching tooth.
Similar proverbs in another language
Latin
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Pectus est, quod disertos facit.
It is the breast that makes the eloquent.
French
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La langue va où la dent fait mal.
The tongue goes where the tooth hurts.
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Coeur en bouche, bouche en coeur.
Heart in mouth, mouth in heart.
German
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Die Zunge stößt immer an den kranken Zahn.
The tongue always bumps into the diseased tooth.
Czech
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Co na srdci, to na jazyku.
What's on the heart is on the tongue.
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Kde koho bolí, tam i ruka sahá.
Where it hurts, there the hand reaches.