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...is again the story of Jonathan Payne's encounters with the figure of Truth. Only this time the story is not confined to humble Earth.

in the sentence above I am not sure of the meaning of - to humble Earth. If somebody could help I would appreciate it very much. Thank you.
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In this context,

humble:
ranking low in a hierarchy or scale : insignificant

m-w.com

CJ
Comments  
turnem I am not sure of the meaning of - to humble Earth
"humble" modifies "Earth."
If you look at it as "not confined to Earth" you will see the meaning.

I have no idea why the author felt the need to talk about the earth being humble but he obviously did.
 CalifJim's reply was promoted to an answer.