This sentence comes from Shakespeare's "The Tempest".
"Hell is empty, the devil is on earth" comes from Act 1, Scene 2 of Shakespeare's "The Tempest". The literal meaning is "Hell is empty because all the devils in it have come to the world." The deeper meaning is "The world is declining, people's hearts are not ancient, and human beings may do anything harmful to nature for their own selfish desires, even more than the devil." horrible".