It is safer to be silent than to reveal one's secret to any one, and telling him not to mention it.
Selling drug secrets violates a trust that is fundamental to the integrity of both scientific research and our financial markets.
Two may keep counsel putting one away!
The thing about secrets is that they are usually best kept by just one person. That was the special thing about secrets. Some people seemed to think that the best way to keep a secret was to tell as many people as possible; what could possibly go wrong for a secret when there were so many people defending it?
It only worked for a little while; the morning after I agreed to go with Universal, an article came out in the Hollywood trade papers, and the secret was out.
What happened down in the dungeons between you and Professor Quirrell is a complete secret, so, naturally the whole school knows.