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[14]
But necessary signs and the enthymemes derived from
them cannot be refuted on the ground of not furnishing a logical conclusion, as
is clear from the Analytics1; the only thing that remains is to prove that the thing
alleged is non-existent. But if it is evident that it is true and that it is a
necessary sign, the argument at once becomes irrefutable; for, by means of
demonstration, everything at once becomes clear.2
Aristotle in 23 Volumes, Vol. 22, translated by J. H. Freese. Aristotle. Cambridge and London. Harvard University Press; William Heinemann Ltd. 1926.
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