Theory:

Once a traveller arrived near an isolated house in the woods during the night. He knocks at the door, saying β€œIs there anybody there?” but no one opens it from inside. He tries to knock the door again and again but gets no response. The traveller amazed by silence and sense that ghosts living in that abandoned house and are listening to his words. And he calls these phantoms or ghosts as "The listeners".
 
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