[8]
How such knowledge may be acquired I
shall explain when I come to the appropriate portion
of this work.1 This knowledge will suggest material
for the examination and will supply weapons ready
to the speaker's hand: it will also indicate to him
the points for which the judge's mind must be
prepared in the set speech. For it is by the set speech
that the credit of witnesses should be established
or demolished, since the effect of evidence on the
individual judge depends on the extent to which he
has been previously influenced in the direction of
believing the witness or the reverse.
And since there are two classes of witnesses2
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