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Secondly, A part of the Definition predicated of any term.
      §13. Secondly, All Propositions, wherein a part of the complex Idea,
which any Term stands for, is predicated of that Term, are only verbal,
v.g. to say, that Gold is a Metal, or heavy. And thus all Propositions,
wherein more comprehensive Words, called Genera, are affirmed of
subordinate, or less comprehensive, called Species, or Individuals,
are barely verbal.
      When by these two Rules, we have examined the Propositions,
that make up the Discourses we ordinarily meet with, both in and
out of Books, we shall, perhaps, find that a greater part of them, than
is usually suspected, are purely about the signification of Words,
and contain nothing in them, but the Use and Application of these
Signs.
      This, I think, I may lay down for an infallible Rule, that where-
ever the distinct Idea any Word stands for, is not known and con-
sidered, and something not contained in the Idea, is not affirmed,
or denied of it, there our Thoughts stick wholly in Sounds, and are
able to attain no real Truth or Falshood. This, perhaps, if well
heeded, might save us a great deal of useless Amusement and
Dispute; and very much shorten our Trouble, and wandring in
the search of real and true Knowledge.
Locke Hum IV, 8, §13, pp. 617