"Not everyone understands what a completely rational process this is, this maintenance of a motorcycle. They think it's some kind of a "knack" or some kind of "affinity for machines" in operation. They are right, but the knack is almost purely a process of reason, and most of the troubles are caused by what old time radio men called a "short between the earphones," failures to use the head properly. A motorcycle functions entirely in accordance with the laws of reason, and a study of the art of motorcycle maintenance is really a miniature study of the art of rationality itself. I said yesterday that the ghost of rationality was what Phædrus pursued and what led to his insanity, but to get into that it's vital to stay with down-to-earth examples of rationality, so as not to get lost in generalities no one else can understand. Talk about rationality can get very confusing unless the things with which rationality deals are also included."
From Zen and the Art of Motorcycle Maintenance, one of the very best books I've ever read (and am currently re-reading)