its the tagline from the movie “sisters” from the director Brian de Palma. I assure you, it is not homework(it does sound like it, eh?), but i need to know what this has to do with anything about twins/relationships.
It’s a twist on the Bible verse “What God hath joined togehter let no man cut asunder.” So I am assuming there is some form of evil in these twins and Satan has joined them together and they will fight to stay together.