'Out of that land went Asshur' means that those with whom such external worship existed started to engage in reasoning about the internal aspects of worship, 'Asshur' being reasoning. 'And he built Nineveh, and Rehoboth city, and Calah' means that in this way they formulated for themselves doctrinal teachings concerning faith - 'Nineveh' means falsities contained in those teachings, as do 'Rehoboth and Calah' though falsities from a different source. 'Resen between Nineveh and Calah' means that they also formulated for themselves doctrinal teachings concerning life -'Resen' means derivative falsities contained in doctrinal teachings. 'Nineveh' is falsity that results from reasonings, 'Calah' falsity that results from evil desires; 'between Nineveh and Calah' is falsity resulting from both. 'This is that great city' means that those matters of doctrine prevailed more and more.