Philip K. Dick, "The Android and the Human" in The Shifting Realities of Philip K. Dick (Lawrence Sutin, ed.) page 208

Sudden surprises, by the way--and this thought may be in itself a sudden surprise to you--are a sort of antidote to the paranoid . . . or, to be accurate about it, to live in such a way as to encounter sudden surprises quite often or even now and then as an indication that you are not paranoid, because to the paranoid, nothing is a surprise; everything happens exactly as he expected, and sometimes even more so. It all fits into his system. For us, though, there can be no system; maybe all systems--that is, any theoretical, verbal, symbolic, semantic, etc., formulation that attempts to act as an all-encompassing, all-explaining hypothesis of what the universe is about--are manifestations of paranoia. We should be content with the mysterious, the meaningless, the contradictory, the hostile, and most of all the unexplainably warm and giving--total so-called inanimate environment, in other words very much like a person, like the behavior of one intricate, subtle, half-veiled, deep, perplexing, and much-to-be-loved human being to another. To be feared a little, too, sometimes. And perpetually misunderstood. About which we can neither know nor be sure; and we must only trust and make guesses toward.