To know everything is to know nothing.
More Italian Proverbs:
If you would be rich in a year, you may be hanged in six months.Italian
A gold ring does not cure a felon.
Italian
God sends nothing but what can be borne.
Italian
The buckets take to fighting with the well, and get their heads broken.
Italian
Who goes himself is in earnest, who sends is indifferent.
Italian
It is not easy to show the way to a blind man.
Italian