…An arbitrary claim is one for which there is no evidence, either perceptual or conceptual. It is a brazen assertion, based neither on direct observation nor on any attempted logical inference therefrom. For example, a man tells you that the soul survives the death of the body; or that your fate will be determined by your birth on the cusp of Capricorn and Aquarius; or that he has a sixth sense which surpasses your five; or that a convention of gremlins is studying Hegel’s Logic on the planet Venus. If you ask him “Why?” he offers no argument. “I can’t prove any of these statements,” he admits — “but you can’t disprove them, either.”

The answer to all such statements, according to Objectivism, is: an arbitrary claim is automatically invalidated. The rational response to such a claim is to…

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