the X that can be Y is not the true X

the X that can be Y is not the true X  Yet another instance
   of hackerdom's peculiar attraction to mystical references -- a
   common humorous way of making exclusive statements about a class of
   things.  The template is from the "Tao te Ching": "The Tao
   which can be spoken of is not the true Tao."  The implication is
   often that the X is a mystery accessible only to the enlightened.
   See the {trampoline} entry for an example, and compare {has
   the X nature}.