[2]
As for proofs, some are artificial, others
inartificial. By the latter I understand all those which have not been furnished
by ourselves but were already in existence, such as witnesses, tortures,
contracts, and the like; by the former, all that can be constructed by system
and by our own efforts. Thus we have only to make use of the latter, whereas we
must invent the former.
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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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