Now, the only possible way in which any person can discover the nature of another mind is by a knowledge of his own. We first learn by experience the qualities of our own mind, how it acts and how it is acted upon, and then, by a process of reasoning, we learn that there are other minds around us, and that they have similar qualities.
The study of mental philosophy, then, is directing attention to the nature of our own mind, and thus discovering the nature of other minds.
It differs from all other studies in this respect, that all men have the materials of the knowledge sought in their own minds, and are required simply to direct attention to their own mental states and acts.
This being so, the common people are as fully qualified to settle all questions in regard to the nature or philosophy of their own minds as the most learned and profound metaphysicians or theologians can be. All that is requisite to success is, that they direct their attention to the subject by suitable methods.
It will be found, on examination, that the common people have secured a written system of mental philosophy as real as has ever yet been furnished by any metaphysician or theologian, while it is free from the great defects which render many works on mental science unpractical and repulsive.
This—the people's system of mental philosophy—it will be the object of what follows to set forth.
In attempting it, we shall find that mankind, in the uses of every-day life, have arranged the various acts and states of mind into classes and subdivisions, and have given names to these classes, and to the specific acts or states included in these classes. These classifications and terms are recorded by lexicographers in their dictionaries.
All words have that meaning which is attached to them by the people who use them. The business of the lexicographer is, not to settle what meaning ought to belong to words, but rather to state the meaning which men actually attach to them in writing and speaking.
In setting forth the people's system of natural philosophy as contained in lexicographies, we find that almost every word is used to express several meanings, similar in some respects and diverse in others. In consequence of this, we only can attempt thus much for mental science, as for many other subjects, viz., to describe the thing intended, and then to select the word most frequently used to express this idea, as set forth in our dictionaries.
This, then, is the course pursued in the following pages. A description is set forth of a given act or state of mind, sufficient to identify it from all others, and then the word is selected from dictionaries of our language which has most frequently been used by the common people in expressing the idea intended. Thus every person who cares enough about the matter to read and think, can decide as well as the most celebrated metaphysician, whether the description given is [pg 053] true to his own experience, and also whether, according to lexicographers, the word selected is frequently used by man to express this idea.