The mill does not grind without water.
More Italian Proverbs:
He that exceeds his commission must answer for it at his own cost.Italian
Have an open face, but conceal your thoughts.
Italian
Drink water like an ox, wine like the king of Spain.
Italian
You will not be loved if you think of yourself alone.
Italian
He who is not impatient is not in love.
Italian
Who does too much, often does little.
Italian