I have read a lot of books about cults but I think that this one really makes an important point. One of the key factors of cults and cult like groups is that language that they use. Speaking the language of the group sets you apart from outsiders. Some words or phrases used inside the group have different meanings to those outside the group.

Looking at the insider language of group gives a really good indication of how insular they are and also how similar they are to other other groups. For example the words and phrases that are particular to certain Christian denominations highlight their key differences.

It also highlights the attraction of in-groups, people like to belong and learning the lingo and speaking like an insider can be fun and add to your sense of belonging.

So looking at the language of groups gives you a tool to analyse and understand the group.

Overall, very useful and interesting.