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[7]
Again there are four forms of
proof. First, we may argue that, because one thing
is, another thing is not; as It is day and therefore not
night. Secondly, we may argue that, because one
thing is, another thing is; as The sun is risen, thereit is day. Thirdly, it may be argued that because one
thing is not, another thing is; as It is not night, therefore it is day. Finally, it may be argued that, because
one thing is not, another thing is not; as He is not a
reasoning being, therefore he is not a man. These
general remarks will suffice by way of introduction
and I will now proceed to details.
Quintilian. With An English Translation. Harold Edgeworth Butler. Cambridge. Cambridge, Mass., Harvard University Press; London, William Heinemann, Ltd. 1921.
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