When it grew beyond Odin's control, she massacred everyone in the palace and tried to seize the throne. When she tried to escape her banishment, he sent the Valkyrie in to fight her back. I only survived because... [Trails off, brooding] Look, I already faced her once back when I believed in the throne, and it cost me everything. That's what's wrong with Asgard. The throne, the secrets, the whole golden sham.
When it grew beyond Odin's control, she massacred everyone in the palace and tried to seize the throne. When she tried to escape her banishment, he sent the Valkyrie in to fight her back. I only survived because... [ Trails off, brooding ] Look, I already faced her once back when I believed in the throne, and it cost me everything. That's what's wrong with Asgard. The throne, the secrets, the whole golden sham.
http://www.moviequotedb.com/movies/thor-ragnarok/quote_79954.html