Priestley inverts the generic expectations of detective fiction to present the key message that 'We are members of one body. We are responsible for each other'
The character of Inspector Goole does seem to be the embodiment of JB Priestley himself – a mouthpiece used to deliver the key message that Priestley wants the audience to take home with them
This is an allusion to the Biblical description of hell as being a 'blazing furnace, where there will be weeping and gnashing of teeth' (Matthew 13:42)
Priestley's point here cannot accurately be labelled as Biblical. His message seems to be that people need to do good deeds to make their way into heaven, and those who don't, will end up in hell