The wine-skin has its reasons for smelling of pitch.
More Portuguese Proverbs:
For a bad tongue scissors.Portuguese
Every one speaks as he is.
Portuguese
The ass of many owners is eaten by wolves.
Portuguese
The swindler readily cheats the covetous man.
Portuguese
You can't make a good shaft of a pig's tail.
Portuguese
A ragged colt may make a handsome horse.
Portuguese