The first thing in establishing a line of argument is to define clearly the proposition to be proved. Nothing further can be done until the writer has made the question at issue clear beyond all possibility of mistake. It is necessary to force one’s own mind to an understanding so sharp and exact that confusion is impossible. The most common failing of mankind is mental ambiguity; and nothing is more frequent than for writers to be entirely mistaken in what they suppose themselves to mean. The whole so-called Socratic method of reasoning—the most teasingly irritating form of logic ever devised; the Spanish-fly form of conviction—consists chiefly in badgering an opponent into a realization of the fact that he does not know what he is talking about; that he is entirely wrong in his notion of his own meaning. The philosopher who in these less patient days should devote himself to questioning so vexing as that with which Socrates is said to have roasted opponents in his time would run imminent risk of a broken head; but the class of illogical arguers against whom he contended is with us to this day.
Once the proposition is clear in the mind, it is necessary to find means to convey it to the understanding of others; to convey it, be it remembered, so that it shall arrive with meaning and sharpness of outline unimpaired. It is the old question of Clearness. An idea which leaves one mind with all the beauty and symmetry of a snow-crystal often gets to another mind as a mere formless drop of snow-water. To the end that the proposition come to the reader with the identity and form uninjured, it is often needful to declare at the outset the sense in which are used the words, terms, and phrases which follow. The only sure way of dealing with a doubtful case is to say plainly: “When such a word is introduced, it means exactly this.” In close writing such defining is almost always essential to the success of the work. You may remember, as an illustration, how Ruskin defines his terms at the beginning of “Modern Painters.” In this way only is it possible to avoid the pitfalls which the varied meanings of the language spread for the foot of the unwary. Some of the many possible errors are dangerous, some easily detected. No one, for instance, need be fooled by a fallacy like the following:—
An artist is an interpreter of the beautiful.
Mr. Rothschild’s chef is an artist.
Hence, Mr. Rothschild’s chef is an interpreter of the beautiful.
There may be those whose respect for gastronomy is so high that they would not shrink from this conclusion, but taking the argument as it stands, it is evident that the word “artist” is used in a double sense. In the first assertion it signifies one who labors in what we call the fine arts; one gifted with that incommunicable power of which we spoke at the beginning of these talks. In the second assertion, the word “artist” signifies one clever and skillful in the practice of his profession.
To take a more serious illustration, the much mooted question whether Walt Whitman is or is not a poet can be argued only after an agreement upon the sense in which “poet” is to be understood. If “poet” means one who writes verse in metrical forms, the proposition cannot be even discussed, because the fact that Whitman did not write formal metrical verse is admitted by everybody. If, on the other hand, the term “poet” be extended to include writers of imaginative and dithyrambic prose, a discussion becomes almost inevitable. Most of the magazine essays which nominally deal with the question stated are really occupied chiefly with the inquiry, “What sense shall we give to the term ‘poet’?”
It is true that the ordinary reader will often fail to make a distinction of this sort. If he be told that the point at issue is Whitman’s poetic standing, he will generally accept the statement, however widely the discussion may depart from the proposition. It might seem to follow that it is of little consequence whether a writer is logical or not; but it is always to be remembered that the fact that a reader does not know by what means he is impressed does not necessarily weaken the impression. Indeed, it is probably true that those who are least aware of the processes of literature are often those most vividly affected by them. The writer who has command of literary forms, who understands clearly what he desires to do and how it is best done, will reach and control the mind of the reader, and need not be disturbed by the fact that the latter does not in the least appreciate the art which has seized and which holds him.
It is of the highest importance to keep in mind when defining propositions or terms that the basis of all discussion must be mutually accepted by writer and reader. Until a starting-point where these two are in accord is found, it is manifestly idle to attempt to draw inferences. The writer who argues with the view of convincing the general public is forced to take as premises truth universally allowed, and facts generally known or which can be supported by easily convincing evidence. He is at the outset met with the difficulty that words are seldom free from ambiguity, and that fact and fiction are as inextricably intertangled as are the rootlets of two trees growing side by side. The nicest judgment must be used in determining how far any statement is admittedly true; not, be it noted, how far it is true, but how far common consent admits its verity. The premise of any argument addressed to the general reader can go no farther than general conviction goes. Even here a writer is often hampered by the fact that the sense of ambiguity is apt to cling to any question concerning which there has been dispute. This is especially true of subjects about which there has been extensive controversy. It is admitted by everybody, for instance, that there are things in Scripture which are not to be accepted with absolute literalness; yet to assume this in argument is almost inevitably to arouse suspicion if not opposition. No matter how carefully the writer endeavors to keep within bounds of common belief, the uncertainty and the doubt which belong to the proposition in its extreme are apt to interfere with its being given even the weight which it may deserve when carefully guarded.