
        from THE COMPLEX VISION OF PHILO St JOHN                     FRIAR9
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        sure.  You.  Me.  Anyone."
             "I don't believe that at all," Philo said.  "There are a lot of
        things that I know for sure."
             "Such as?"
             "Such as the law of gravity.  I know that for sure."
             "Tell me," the friar said. "I've often wondered."
             "Bodies  are  attracted  to  one another by a force that varies
        directly as the product of their masses  and inversely as the square
        of the distance between them.  Now that's for sure."
             "No," the friar said.
             Philo stared at him, puzzled.
             "Words," the friar said.  "Just words.  You  haven't  told me a
        thing, not a single thing."
             "I've told you the law of gravity," Philo said.  "I've told you
        how it works."
             "No," the  friar  said. "You haven't told me how it works.  You
        have given me a quantitative observation  after  the  fact.  Nothing
        more.  What precisely causes a stone to fall?  I still don't know."
             "That's an old argument," Philo said.
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