The word "diagnosis" is derived from two Greek words, "dia," meaning through, and "gnosis," meaning knowing. It therefore means literally "through knowledge," "to know thoroughly," or, as we now say, "thorough knowledge." The old form of the word is still retained in the very common expression "to know it through and through."

The primary purpose of diagnosis is to locate a difficulty, to find an internal disorder that is causing unpleasant symptoms. It will readily be granted that this is only desirable when, after the internal disorder has been located, we are able to do something to correct it; that otherwise it is of no more importance than to learn by post-mortem examination what caused death. Indeed, to know what the trouble is without knowing how to deal with it, is a very grave source of danger, and has caused many a death through resort to wrong methods. In a large percentage of cases Nature will heal, if her processes are not interfered with, and in all cases she is the real physician; our only proper office is to supply the right materials, and to leave her to use them as she will.

True diagnosis, merely an interpretation of Nature's language.

Correct diagnosis is important because it is the guide - the beginning - the primary step in the treatment of disease. Wrong diagnosis is usually followed by wrong methods of treatment, while correct diagnosis simplifies, and points the practitioner, with certainty, to the interpretation of Nature's language (symptoms). With an understanding of these, the remedy, in most cases, will suggest itself.

The human body and the linotype machine compared.

The linotype machine that set the matter you are now reading is composed of several thousand parts. The keyboard is operated by the compositor, in much the same manner as that of a typewriter, and the delicate mechanism produces the metal lines of type ready to be "made up" in "forms" for the press. Where several such machines are in use, an expert machinist is usually employed to keep them in order. He can take them apart, study the mechanism at leisure, and reassemble them, yet it not infrequently happens that almost insurmountable difficulties are encountered. What would be the difficulties, then, if the machine were enclosed in a case that could not be opened, with only the keyboard exposed? What mechanical engineer in all the world could then make it work if something went wrong? One who could tell from the faulty action just what the matter was, and correct it from without, would be looked upon as a wizard.

Belief in the magical effect of drugs.

The human body is incomparably more complex and delicate than any machine, yet it is a widespread superstition that one skilled in the art of locating disorders (diagnosis) can, almost invariably, correct them by the magical effect of drug applications. This is a superstition with no more foundation in fact than the parallel one that a man of vicious character can be made virtuous by a magical process. He may turn from vice to virtue in a moment, but he can become spiritually strong and wholesome only by growth, and by conformity to the moral law. In like manner bodily health comes not by magic, but by right living, by conformity to the laws of heatlh.

It is literally true that "the only perfectly performed functions of the body are the involuntary or the automatic functions." Those that are even partly under the control of the will, such as breathing, are almost invariably ill done. The infinite wisdom is strikingly exemplified in the fact that the vital functions are quite independent of our volition except for "hindrances or ruinous urgence." We may, and we do hinder them constantly, and we subject them to "ruinous urgence" almost continuously. These two facts are responsible for nearly all the bodily ills from which we suffer.

Involuntary functions are perfectly performed.

Nature's marvelous methods beyond our comprehension.

The marvelous metabolism by which energy is translated into life, by Nature's processes, is not only beyond our control, but beyond our comprehension. We should make it an invariable rule, therefore, never to interfere in any way, but to confine our efforts to the task of supplying Nature with material with which to do her wonderful work, and to an observance of the common laws of health and life.