I have never actually been to a Gurdjieff group, so my report is not going to be firsthand, but I do know that Gurdjieff himself, at his Center for the Harmonious Development of Man, kept his disciples up very late, put them to work on arduous tasks (some of them were even pointless; he had someone - I think it was de Hartmann, the composer - dig ditches and then fill them up again. I have heard
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Recovery from Destructive Cults and Groups