Attolia's library or the gods?

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Hello, fellow Sounisans =D

So this is a question about a scene that I've never really understood from A CoK. and I don't quite know how to phrase it I'm that confused...Yikes!

Here goes: I don't understand the signifigance of the library and I feel like I'm missing something major.  Is it that Moira was trying to show Sophos that Attolia was where he belonged?  Or was it somehow a place that Gen's ever-so-great-grandfather had also seen in his dreams?  And why would Gen and Helen want to prevent Sophos from seeing it?

So, long question short, I just don't get it, so any thoughts or observations would be greatly appreciated!

Thanks,

~books