Before, however, I proceed to classify the various
species of artificial proof, I must point out that there
are certain features common to all kinds of proof.
For there is no question which is not concerned
either with things or persons, nor can there be any
ground for argument save in connexion with matters
concerning things or persons, which may be considered
either by themselves or with reference to something
Quintilian. With An English Translation. Harold Edgeworth Butler. Cambridge. Cambridge, Mass., Harvard University Press; London, William Heinemann, Ltd. 1921.
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