Never make a threat you cannot carry out

Never make a threat you cannot carry out.

Prov. You should not threaten to do something you cannot do; otherwise, people will not believe you are serious when you threaten. Bill: If you don't stop being rude to me, I'll have you fired! Jane: You're not my boss. Never make a threat you cannot carry out.
See also: cannot, carry, make, never, out, threat