Why is it important to eavesdrop?

Eavesdropping is listening to conversation without permission. Although it may depict bad manners, the message listened to while eavesdropping might be important for the eavesdropper or someone else in a remote place. It is not eavesdropping alone that can save one, sometimes facial signs can warn one. If only people will pay a little bit more attention, the world would be a better place to live in.