+70. The Use of Explanation in Argument.+--In preparing an argument we
must consider first the amount of explanation that it will be necessary to
make. We cannot expect one to believe a proposition the meaning of which
he does not understand. Often the explanation alone is sufficient to
convince the hearer. Suppose you are trying to gain your parents' consent
to take some course of study. They ask for an explanation of the different
courses, and when they know what each contains they are already convinced
as to which is best for you.
If you are trying to convince a member of your school board that it would
be well to introduce domestic science into the high school, and he already
understands what is meant by the term "domestic science," you not only
waste time in explaining it, but you make him appear ignorant of what he
already understands. With him you should proceed at once to give your
reasons for the advisability of the introduction of this branch into your
school. On the other hand, if you are talking with a member who does not
understand the term, an explanation will be the first thing necessary. It
is evident, therefore, that the amount of explanation that we shall make
depends upon the previous knowledge of the audience addressed. If we
explain too much, we prejudice our case; and if we explain too little, the
reader may fail to appreciate the arguments that follow.
The point of the whole matter, then, is that explanation is the first step
in argument, and that in order to determine the amount necessary we must
consider carefully the audience for which our argument is intended.
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