When fortune knocks, open the door.
More German Proverbs:
The dog does not get bread every time he wags his tail.
All good things must come to an end.
A lot will stick to dirty hands.
If the landlady is fair, the wine is fair.
So many countries, so many customs.
Those who don't pick roses in summer won't pick them in winter either.
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Poverty has no kin.
Nothing so bad but it finds its master.
After the house is finished, he deserts it.