Hide your secret even from the closest friend; learn to be silent.
Quiet down, we don't want to wake the Russians.
One of the best ways to keep a great secret is to shout it.
I am certain that the safest way to defend your character is never to say a word about it.
The only way to establish any kind of mystique, is to completely shut up and never talk to anyone. And I'm contractually obligated not to shut up.
He that would live clear of envy must lay his finger on his mouth, and keep his hand out of the ink-pot.
Also, when I didn't like something, I could keep my opinion to myself.
Don't ever tell anybody anything. If you do, you start missing everybody.
If a well-constituted individual refrains from blazoning aught amiss or calamitous in his family, a nation in the like circumstance may without reproach be equally discreet.
I won this award for keeping my mouth shut, so I think I'll do it again now.
I find it preferable not to have public opinions about anything. It's good for me to shut up.
