if vision is restricted to a belief system, or if it is divorced from all belief systems, it ceases to be vision. What is necessary is that it not restrict itself to a belief system but that belief systems always fall within the scope of poetic horizons... Visionaries (what we shall refer to as poets) do not destroy the walls, but show the openings through them. They do not promise what believers will see, only that the walls do not contain the horizon.
- James Carse