Business is business. 
Proverbs on a similar topic
- In for a penny, in for a pound.
- Sink or swim.
- What is, must be.
- The die is cast.
- Nothing ventured, nothing gained.
- Every man is the architect of his own fortune.
- Render unto Caesar the things which are Caesar's.
- Man proposes, God disposes.
- Once you pledge, don't hedge.
- The horse thinks one thing and he who rides him another.
Related proverbs
Similar proverbs in another language
French
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Les affaires sont les affaires.
Business is business.
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En affaires comme en affaires.
Business as in business.
German
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Dienst ist Dienst und Schnaps ist Schnaps.
Service is service and schnapps is schnapps.
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Dienst ist Dienst.
Service is service.
Czech
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Služba je služba.
Service is service.
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Kšeft je kšeft.
Business is business.
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Služba není družba.
The service is not a company.