Have an open face, but conceal your thoughts.
More Italian Proverbs:
He who cannot revenge himself is weak, he who will not is contemptible.Italian
Every one thinks himself without sin because he has not those of others.
Italian
A candle loses nothing by lighting another candle.
Italian
The earth covers the errors of the physician.
Italian
The flatterer's throat is an open sepulchre.
Italian
Who has no plagues makes himself some.
Italian