Quality cannot be defined in a rational way, it can only noticed when it happens. Yet quality is everything: the difference between someone who cares, and one who does not; between a machine that can enrich your life, and one that explodes into a heap of useless mental.(I think he intends "metal"; TG) Yet instruction manuals, the narrator observes, totally leave out of the picture the person who is putting something together.
From a review of Zen and the Art of Motorcycle Maintenance by Tom Butler Bowdon. This is one of the more cohesive and thoughtful reviews I have seen of Pirsig's 1974 classic, a book that rewards multiple readings and a book that deserves to be read with "quality".