The word “Paradise” dates back to an ancient word for “enclosure, park”.  During the time of the 1st Persian Empire, around 700 BCE*, the meaning became “a walled garden”. 

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The wall separates the garden from the rest of the world.

So,  "Paradise" has 3 realms : inside the garden, outside the garden and the dividing wall.  

The wall keeps "things" out and keeps "things" in.  A garden cannot contain every-thing.

a

The totality of Reality - Unity - has no boundaries, is not segregated. e

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Merge individual consciousness into the existing Unity dissolving 3 realms as, by degrees, the limited becomes universal....

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*BCE & CE - Before the Common Era and the Common Era - generic notation replacing BC and AD