When Jack Russell chooses to read it he reads:
Every human has a spirit, which takes on a form in the spiritual world. Elements take on a form in the elemental world. mutual intervention is possible, as the worlds are highly contiguous.
It can also be found in a Moon Tower Research Lab (the first one while going up the stares from the entrance). When Jack tries to read it, it says "There are to many technical terms and it is not at all comprehensible."