The psychotic does not merely think he sees four blue bivalves with floppy wings wandering up the wall; he does see them. An hallucination is not, strictly speaking, manufactured in the brain; it is received by the brain, like any 'real' sense datum, and the patient act in response to this to-him-very-real perception of reality in as logical a way as we do to our sense data. In any way to suppose he only 'thinks he sees it' is to misunderstand totally the experience of psychosis.
Philip K. DickI never felt like that before. Maybe it could be depression, like you get. I can understand how you suffer now when you're depressed; I always thought you liked it and I thought you could have snapped yourself out any time, if not alone then my means of the mood organ. But when you get that depressed you don't care. Apathy, because you've lose a sense of worth. It doesn't matter whether you feel better because you have no worth.
Philip K. DickI'm tired and I want to rest; I want to get out of this and go lie down somewhere, off where it's dark and no one speaks. Forever.
Philip K. DickHe started keeping a journal - had been, in fact, secretly doing so for some time: the furtive act of a deranged person.
Philip K. DickThe mentally disturbed do not employ the Principle of Scientific Parsimony: the most simple theory to explain a given set of facts. They shoot for the baroque.
Philip K. DickDrug misuse is not a disease, it is a decision, like the decision to step out in front of a moving car. You would call that not a disease but an error in judgment. When a bunch of people begin to do it, it is a social error, a life-style. In this particular life-style the motto is "Be happy now because tomorrow you are dying," but the dying begins almost at once, and the happiness is a memory.
Philip K. Dick