What sentence is used to describe an informer?

Confucius said: a gentleman is righteous, but a villain is profitable. )

Confucius said: The week of gentlemen is incomparable, and the week of villains is incomparable. Confucius said: gentlemen unite without collusion, while villains collude without collusion. )

There is also the most classic: "There is nothing important in the world, and much ado about nothing."

Haha, are you a hermit? You should be good at swearing. Don't let that little man understand, hehe ~ ~