He works best who knows his trade. 
Related proverbs
Similar proverbs in the same language
English
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He's not the best carpenter that makes the most chips.
Similar proverbs in another language
French
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C'est au pied du mur qu'on voit le maçon.
It's at the foot of the wall that you see the mason.
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Bon cavalier monte à toute main.
Good rider rides freehand.
German
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Jeder ist Meister in seinem Handwerk.
Everyone is a master at his craft.
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Alles hat seinen Meister.
Everything has its master.
Czech
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Každý je mistrem ve svém řemesle.
Everyone is a master of their craft.
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Co pronikneš, tím vynikneš.
What you penetrate is what you excel at.
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Dílo se mistra bojí.
The work is afraid of the master.
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Řemeslníka dílo ukáže.
The craftsman's work will show.