Those who have given a careful study to the arguments that are likely to be produced by their
opponents or the replies which may be made by
themselves are almost always ready for the fray.
There is, however, a further device available which
consists in suddenly introducing into the debate arguments which were deliberately concealed in our set
speech: it is a procedure which resembles a surprise
attack or a sally from an ambush. The occasion for
its employment arises when there is some point to
which it is difficult to improvise an answer, though
it would not be difficult to meet if time were
allowed for consideration. For solid and irrefutable
arguments are best produced at once in the actual
pleading in order that they may be repeated and
treated at greater length.