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"Reason itself is fallible, and this fallibility must find a place in our logic."
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"It had to be a trick or you couldn't have done it."

"Be aware of this truth that the people on this earth could be joyous, if only they would live rationally and if they would contribute mutually to each others' welfare.This world is not a vale of sorrows if you will recognize discriminatingly what is truly excellent in it; and if you will avail yourself of it for mutual happiness and well-being. Therefore, let us explain as often as possible, and particularly at the departure of life, that we base our faith on firm foundations, on Truth for putting into action our ideas which do not depend on fables and ideas which Science has long ago proven to be false."

"There's more to logic than identifying logical fallacies."

"Not everyone understands what a completely rational process this is, this maintenance of a motorcycle. They think it's some kind of '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 was upset. I had always believed logic was a universal weapon and now I realized how its validity depended on the way it was employed."

"Newton invented a new form of reason. He expanded reason to handle infinitesimal changes and I think what is needed now is a similar expansion of reason to handle technological ugliness. The trouble is that the expansion has to be made at the roots, not at the branches, and that's what makes it hard to see."

"The study of the art of motorcycle maintenance is really a miniature study of the art of rationality itself. Working on a motorcycle, working well, caring, is to become part of a process, to achieve an inner peace of mind. The motorcycle is primarily a mental phenomenon."

"If man was a logical creature: his last suspect-namely, his mouth-was going to be the first; whenever he thinks that someone, or, something is smelly."

"Logic plus logic equals the illogical. Do you know what I mean?"
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