Almost all of my spiritual practices that involved other people have taken place in small groups. This article suggests that small groups work better than large ones because of the way human social brains are wired.
Reading it, I suddenly realized part of the reason I'm reluctant to get more involved in my local sangha (http://insightmeditationcenter.org) is because I have no experience of doing spiritual stuff in the context of more than 4–8 people. (I went to a big church with my parents when I was growing up, but that wasn't at all spiritual for me.) I've gone to the sangha to sit but I don't take part in planning or running things. Sitting with others is different from sitting alone, which is also true for me in other spiritual activities—some kind of group energy is generated. But my limited attempts to socialize with people at the sangha haven't brought a strong feeling of connection.
I couldn't necessarily say this is all due to human brain limits on the number of people we can know well, though, because I've always built or joined as a founding member covens and other spiritual groups instead of joining an already established one, and I think that makes a difference to me, along with the number of participants.
Also my tendency to other myself (thinking "I'm too weird for these people," in the absence of any corroborating data) is active at the sangha because I don't know the people from other contexts. There was an LGBQT* retreat last weekend and I wanted to go, but I couldn't drag myself out of bed early enough (why do Buddhists always start things so effing early?).
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