Why?

LET SLEEPING DOGS LIE..

Do u know what IT means?
May be you do not..
Those who knew it, fine..
Those who doesn't know, let me explain this phrase..

If someone is told to let sleeping dogs lie, it means that they shouldn't disturb a situation as it would result in trouble or complications.

So, suddenly without anything happen, If you are receiving a message from your friend, consisting this phrase means, what ll you do?
So, we can easily turn the same phrase to him know.. ?
Mr. Mr..