To cast pearls before swine.
More Romanian Proverbs:
He that has no money needs no purse.Romanian
The one who makes little bad things, can as easyly do big bad things.
Romanian
There is a time to weep, and a time to laugh.
Romanian
Where we least think, there goeth the hare away.
Romanian
Dicing, drabbing and drinking bring men to destruction.
Romanian
His heart is in his mouth.
Romanian