He who has been at the mill has flour on his hat.
More Bulgarian Proverbs:
Whip the saddle and give the mule something to think about it.Bulgarian
The crow pecks at the ox to clean it -- not to feed from it.
Bulgarian
The wolf changes only his coat -- not his character.
Bulgarian
A gentle word opens an iron gate.
Bulgarian
When the sea turned into honey, the beggar lost his spoon.
Bulgarian
A good cock can never have too many hens.
Bulgarian