The Urantia Book[1]

There's a peculiar richness, depth, and inventiveness to it that has kept me coming back to it on occasion for over 20 years of intermittent reading. I haven't come across another book quite like it. Of the few people who have heard about it, most bounce right off after skimming it, very understandably so.

But taken as a human project it's really quite an extraordinary piece of work. Having written short fiction and most of a novel before, I feel like I have a sense of the hard work it takes to master the craft of writing, and I have a lot of respect when I see not just good writing but writing that innovates, keeps pushing. The Urantia Book is like a fractal in its simplicity vs the narrative spun out from the seed ideas. The mental model is to merge both a science mindset and spirituality.

Recommend the iPhone app of it (is free, and has a quotes collection included).

[1] https://en.wikipedia.org/wiki/The_Urantia_Book