"The fool steps boldly into a house, while the well-bred man remains outside;
A boor peeps through the doorway of a house, but a cultured man keeps his glance cast down.
It is rude for one to listen at a door; a cultured man would be overwhelmed by the disgrace of it.
The lips of the impious talk of what is not their concern, but the words of the prudent are carefully weighed" (Sirach 21: 22-25, NAB).