In the ancient world cities were nearly nations unto themselves – they existed within walls, with their own laws and customs, generally centered on the common purpose of trade. This is not as much the case in the modern world, but we still tend to divide ourselves city by city in terms of sports teams, accents, music and culture, and still tend to generalize the character of people from other cities. It follows, then, that in the Bible cities represent various doctrines – collections of inter-related ideas about spiritual reality. Such doctrines can be based on anything from the Lord’s true teachings – the New Jerusalem seen by John in Revelation – to the falsity and heresy of Sodom and various cities obliterated by the people of Israel at God’s command. On the most personal level, a city can also represent the natural mind of one person – which makes sense since we each to some extent have our own doctrine and our own set of ideas and beliefs.

3413. 'And filled them up with dust' means by means of earthly things, that is, by means of self-love and love of material gain. This is clear from the meaning of 'dust' as such, dealt with in 249. The meaning is that those who are called 'the Philistines', that is, who are not concerned with life but with doctrine, efface interior truths by means of earthly loves, which are self-love and love of gain. Because of those loves they are called 'the uncircumcised', 2039, 2049, 2056, 2632. Indeed people who are under the influence of those loves cannot avoid 'filling up the wells of Abraham with dust', that is, effacing the interior truths of the Word by means of earthly things, for there is no way in which they are able from these loves to see spiritual things, that is, things which belong to the light of truth from the Lord. In fact those loves introduce darkness, and this banishes that light, for as stated just above in 3412, as the light of truth from the Lord draws nearer, people who are concerned with doctrine alone and not with life are plunged into complete darkness and stupidity. Indeed they become like those in a rage, doing all they can to destroy truths in every way. For self-love and the love of gain are such that they do not allow any truth at all from the Divine to come anywhere near them. Nevertheless those people are able to boast of and pride themselves in the fact that they know truths; indeed they proclaim them with seeming zeal. It is however the fires of self-love and love of gain which inflame them and spur them on, and their zeal is merely the enthusiasm fired by those loves. This becomes quite clear from the fact that even though truths run counter to such persons' actual lives they are able to proclaim them with the selfsame zeal or enthusiasm. These are the earthly things which block the Word itself, the fountain of all truth.