INTEREST DYNAMIC.--Many of our milder feelings terminate within ourselves, never attaining sufficient force as motives to impel us to action. Not so with interest. Its very nature is dynamic. Whatever it seizes upon becomes _ipso facto_ an object for some activity, for some form of expression of the self. Are we interested in a new book, we must read it; in a new invention, we must see it, handle it, test it; in some vocation or avocation, we must pursue it. Interest is impulsive. It gives its possessor no opportunity for lethargic rest and quiet, but constantly urges him to action. Grown ardent, interest becomes enthusiasm, "without which," says Emerson, "nothing great was ever accomplished." Are we an Edison, with a strong interest centered in mechanical invention, it will drive us day and night in a ceaseless activity which scarcely gives us time for food and sleep. Are we a Lincoln, with an undying interest in the Union, this motive will make possible superhuman efforts for the accomplishment of our end. Are we man or woman anywhere, in any walk of life, so we are dominated by mighty interests grown into enthusiasm for some object, we shall find great purposes growing within us, and our life will be one of activity and achievement. On the contrary, a life which has developed no great interest lacks motive power. Of necessity such a life must be devoid of purpose and hence barren of results, counting little while it is being lived, and little missed by the world when it is gone. HABIT ANTAGONISTIC TO INTEREST.--While, as we have seen, interest is necessary to the formation of habits, yet habits once formed are antagonistic to interest. That is, acts which are so habitually performed that they "do themselves" are accompanied by a minimum of interest. They come to be done without attentive consciousness, hence interest cannot attach to their performance. Many of the activities which make up the daily round of our lives are of this kind. As long as habit is being modified in some degree, as long as we are improving in our ways of doing things, interest will still cling to the process; but let us once settle into an unmodified rut, and interest quickly fades away. We then have the conditions present which make of us either a machine or a drudge. 2. DIRECT AND INDIRECT INTEREST We may have an interest either (1) in the doing of an act, or (2) in the end sought through the doing. In the first instance we call the interest _immediate_ or _direct_; in the second instance, _mediate_ or _indirect_.