Today a man, tomorrow a mouse. 
Proverbs on a similar topic
- Slowly but surely.
- Slow and steady Wins the race.
- Out of the frying pan into the fire.
- Rome was not built in one day.
- More haste, less speed.
- Make haste slowly.
- Nothing should be done in haste but gripping a flea.
- Hasty climbers have sudden falls.
- Good and quickly seldom meet.
- Stuff today and starve tomorrow.
- Out of the peat-pot into the mire.
Related proverbs
Similar proverbs in the same language
English
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Today a man, tomorrow none.
Similar proverbs in another language
Latin
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Ab equo ad asinum.
From the horse to the donkey.
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Ab equis ad asinos transcendere.
To pass from horses to asses.
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De caelo in coenum.
From heaven to hell.
French
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Aujourd'hui chevalier, demain vacher.
Today a knight, tomorrow a cowherd.
German
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Man kann bald vom Pferd auf den Esel kommen.
You can soon get from horse to donkey.