I've been reading a lot about the Thalmor and their goal of pretty much undoing existence.
What I'm wondering is: how do we know that this is their goal, or at least the higher-ups' goal?
Quite simply: is there a book that goes into it? MK posted some stuff about them? Is it all reading between the lines? In short, where's my sources ?

He said it several years ago, it's no longer on the forums. Oldest thing I can find is Word Merchant quoting it http://www.gamesas.com/index.php?/topic/832707-numidium/page__view__findpost__p__12109195. Alternatively, TIL has MK's post saved http://www.imperial-library.info/content/forum-archives-michael-kirkbride.