Phillip K. Dick: where all those wonderful books came from

LOS ANGELES REVIEW OF BOOKS | The Exegete:

"There are, in fact, numerous ways to find a trail through this wilderness of crazed speculation. At one and the same time, the Exegesis is an expository prop to Dick’s later fiction, a kind of creative workshop testing out ideas that would find form in VALIS and The Divine Invasion; the tortuous searchings of a remarkably resilient spirit mangled by years of drug abuse, failed marriages, and literary neglect; a palimpsest of learned disquisitions on complex philosophical problems, such as the nature of the relationship between identity and time; a contemporary recasting of Gnostic theology, the Dead Sea scrolls rendered as a kind of space opera; and much more.

Personally I think The man in the high castle, A Scanner Darkly, and VALIS are three of his best.