I've started seeing the concept of "satan" as a necessary feature of "heaven" - not someone banished, but a representation of the necessary escape hatch in every system
how do you get out? there's always a way, always a way
(see also: "10% revolt")
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theory: it's always tunnelable, as in you can always make it out the other side, but you gotta bring your whole self and possibly stop up the thing that looks like the entrance you arrived by in order to find the next move
theory: this is as good as a law for anyone experiencing a life rendered probabilistically
extra-tenuous theory: this is how houdini worked