The edge of things is a liminal space -- a very sacred place where guardian angels are especially available and needed. The edge is a holy place, or as the Celts called it, "a thin place" and you have to be taught how to live there. To take your position on the spiritual edge of things is to learn how to move safely in and out, back and forth, across and return. It is a prophetic position, not a rebellious or antisocial one. When you live on the edge of anything with respect and honor, you are in a very auspicious position. You are free from its central seductions, but also free to hear its core message in very new and creative ways. When you are at the center of something, you usually confuse the essentials with the non-essentials, and get tied down by trivia, loyalty tests and job security. Not much truth can happen there.
To live on the edge of the inside is different than being an insider, a "company man" or a dues paying member. Yes, you have learned the rules and you understand and honor the system as far as it goes, but you do not need to protect it, defend it or promote it. It has served its initial and helpful function. You have learned the rules well enough to know how to "break the rules" without really breaking them at all.
There is a place and time for being outside, or you never really understand or appreciate the inside.
All of these situations are describing the unique and rare position of a Biblical prophet: He or she is always on the edge of the inside. Not an outsider throwing rocks, not a comfortable insider who defends the status quo, but one who lives precariously with two perspectives held tightly together -- the faithful insider and the critical outsider at the same time. Not ensconced safely inside, but not so far outside as to lose compassion or understanding. Like a carpenter's level, the prophet has to balance the small bubble in the glass between here and there, between yes and no, between loyalty and critique. The prophet must hold these perspectives in a loving and necessary creative tension. It is a unique kind of seeing and living, which will largely leave the prophet with "nowhere to lay his head" while easily meriting the "hatred of all" -- who have invariably taken sides in opposing groups (Luke 21:16-17). The prophet speaks for God, and almost no one else, it seems.
People inside of belonging systems are very threatened by those who are not within that group. They are threatened by anyone who has found their citizenship in places they cannot control.