Silence is Deadly

“You ask me why I’m weary
Why I can’t speak to you
You blame me for my silence”

Blue Oyster Cult “Veteran of the Psychic Wars”

Don’t cast pearls before swine.

If someone is incapable of hearing you, stop talking.  You are wasting your time and will only make them angry. 

The truth offends those who lie, and they will blow it back at you.  Better to hold your tongue.