In for a penny, in for a pound. 
Proverbs on a similar topic
- Sink or swim.
- What is, must be.
- Business is business.
- 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 the same language
English
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You cannot say A without saying B.
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In for a lamb, in for a sheep.
Similar proverbs in another language
Latin
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Aut non tentaris, aut perfice.
Either don't try, or do it.
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Aut numquam temptes, aut perfice.
Either never try, or do it.
French
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Le vin est tiré, il faut le boire.
The wine is drawn, it must be drunk.
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Qui en jeu entre, jeu consente.
Who in play enters, play consents.
German
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Wer A sagt, muß auch B sagen.
Whoever says A must also say B.
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Wer das Spiel mit anfängt, muß es mit fortsetzen.
Whoever starts the game with must continue it with.
Czech
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Když řekneš „á”, musíš říct také „bé".
When you say "ah," you must also say "bé."
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Vzav za řemen, neprav, že nepeven.
He took the belt, unbelieving that he had not sung.