Sodom
The city of "Sodom", in the Bible, represents the love of self and the love of ruling or dominating others springing from the love of self. This is why it is depicted as such an evil place, and why it was utterly destroyed by God.
This is not, of course, the usual association people have with Sodom; it has long been connected to homosexuality because in Genesis 19 the men of the city tried to rape the male angels who were visiting Lot. But if you think about it, it makes sense. Experts regard rape as a crime of violence and domination more than a crime of sexual desire. The fact that Lot offered his daughters as an alternative indicates that he thought that the men of the city were not picky about who they dominated and violated. Their chief pleasure was in the domination. All stories about adultery in the Bible -- from the more mild up to and including the intended homosexual gang rape in Sodom -- are actually depictions of selfishness in various forms.
Neighbor
'The neighbor' is not only an individual person, but also people collectively, as a less or greater society, our country, the church, the Lord's kingdom, and above all, the Lord Himself. These people are 'the neighbor' to whom good is to be done from love. A society is our neighbor more than a single person, because it consists of many people. Our country is our neighbor more than a society because it is like a parent because a person is born in it, and is nourished and protected from injuries by it. The church is our neighbor more than our country, because one who provides for the church provides for the souls and eternal life of the people who dwell in his country. The Lord's kingdom is our neighbor in an even higher degree, because the Lord's kingdom consists of all in good, as well people on the earth as those in the heavens.
