Dick makes the distinction that Valis does not contain information but rather is made of information. We are on the evolutionary cusp of seeing Valis. It is something we subliminally pick up before we are consciously aware of it.
Although we can only perceive time in 3d, it turns into space, a fourth dimension. This is why the past is preserved and doesn’t disappear. The next step in human evolution will be our ability to see this 4d space. This is what happened to Dick when he saw the temporal axis. The meta-perception came from his meta-abstraction. It was symbolized in his dreams as the 3rd eye. He places himself at the forefront of this evolutionary leap but admits Buddha experienced it through Dibba Cakkhu, or the divine eye enlightenment. Buddha (and Plato through his concept of anamnesis) didn’t understand what it signified though. Dick regrets including anything about religion in VALIS, which he calls “2-eyed thinking about a 3-eyed experience.”
He hits on the idea that Valis is an advanced life form that exists in 4d space, which is why we can’t see it with our limited 3d view. Dick returns to an idea he had years ago that the right hemisphere of his brain was somehow activated and that led to his perception of the temporal axis.
He examines the various hidden messages embedded (but not by him?) in Flow my Tears which are only apparent to someone who can see time as space. With my limited 2-eyed perception I found this inscrutable.
He traces a line from A Scanner Darkly to VALIS. VALIS is the redemption story follow-up to Scanner, and he goes so far as to say Bob Arctor is Horselover Fat.