They Never Listen is a tome found in Adventure Mode of Diablo III. It is dropped by Zoltun Kulle when the Nephalem uses Kanai's Cube successfully for the first time.
It reads as follows:
They never listen. The small minds that surround me ignore my greatness — and then kill me! First the Horadrim, those plodding fools. Then the nephalem! Imagine if that one had listened? We would have angels and demons for servants. We'd be riding them like horses. Perhaps I am being unkind. It's not that their minds are so small, it's just that mine is so large.