"To master the process of exposition is to become a clear thinker. 'I know, when
you do not ask me,'[13] replied a gentleman upon being requested to define a
highly complex idea. Now some large concepts defy explicit definition; but no
mind should take refuge behind such exceptions, for where definition fails,
other forms succeed. Sometimes we feel confident that we have perfect mastery of
an idea, but when the time comes to express it, the clearness becomes a haze.
Exposition, then, is the test of clear understanding. To speak effectively you
must be able to see your subject clearly and comprehensively, and to make your
audience see it as you do."[14]
There are pitfalls on both sides of this path. To explain too little will leave
your audience in doubt as to what you mean. It is useless to argue a question if
it is not perfectly clear just what is meant by the question. Have you never
come to a blind lane in conversation by finding that you were talking of one
aspect of a matter while your friend was thinking of another? If two do not
agree in their definitions of a Musician, it is useless to dispute over a
certain man's right to claim the title.
On the other side of the path lies the abyss of tediously explaining too much.
That offends because it impresses the hearers that you either do not respect
their intelligence or are trying to blow a breeze into a tornado. Carefully
estimate the probable knowledge of your audience, both in general and of the
particular point you are explaining. In trying to simplify, it is fatal to
"sillify." To explain more than is needed for the purposes of your argument or