Board Thread:Lore Discussion/@comment-24339224-20160718084244/@comment-28636845-20161106050059

I think that the Elder Scrolls were created when time was alinear, perhaps being the plans that Magnus used to construct Mundus (thus, its blueprints) and, unlike everything else, maintained a connection to that state due in all likelihood to Lorkhan's comprehension of CHIM, which was integral to Mundus' creation. Therefore, they would, when read, only be completely understood by a being whose mind was made to withstand alinear progression of time itself. However, the Aedra can't read them because the Scrolls are tied Mundus, and thus only beings who are incapable of fully comprehending them can read them.

Or, more simply, because looking back on that it needs simplification: The scrolls are a textual portal back into a "time" in which there WAS no time, as they are the schematics used to make Mundus, and thus Time, and so therein their whole purpose and the reason mortals go mad, blind, etc. when they read them.