The Thousandfold Thought is the third book in the Prince of Nothing series by Scott Bakker. I thought it would be the concluding book in the series, but the ending is left open. The book’s a solid advancement of the series; we get to meet papa Moënghus, find out that he’s been behind everything– but that doesn’t sour it all.
The book does a good job of bringing several threads to an end. It looks like he left the world alone for several years (real time and in the world) before beginning a sequel trilogy last year. The first book is The Judging Eye, which I may check out.