I have used the word "tension" to describe the psychic fact present in desire. I have done so for want of a better word. Of the physical basis of desire, of what takes place in the brain, we know nothing. With the psychic fact, the feeling of agitation and unrest, we are all familiar. Of the tendency of desire to discharge itself in action we are aware. A desire appears to be an inchoate volition--that which, if ripened successfully and not nipped in the bud, would become a volition. It may be looked upon as the first step toward action--a step which may or may not be followed by others. It does not seem out of place to call it a state of tension, of strain, of inclination. In speaking, thus, we use physical metaphors, but they do not appear out of place. 33. DESIRE OF THE UNATTAINABLE.--But if a desire may be regarded as an unripe act of will, an inchoate volition, how is it that we can desire the unattainable, a sufficiently common experience? I may bitterly regret some act of my own in the past; I may earnestly wish that I had not performed it. But the past is irrevocable. Hence, the desire for the attainment of what is in this case the object, a different past, can hardly be regarded as even a preparatory step toward attainment. In this case it can not, and were all desires directed upon what is in the nature of the case wholly unattainable by effort, it would occur to no one to speak of desire as a first step toward action. But normally and usually desires are not of this nature. They usually do constitute a link in the chain of occurrences which end in action. Did they not, they would have little significance in the life-history of the creature desiring. With the appearance of free ideas, with an extension of the range of memory and imagination, objects may be held before the mind which are not properly objects to be attained. Yet such objects are of the kind which attract or repel, i.e., of the kind which men endeavor to realize in action. They cannot be realized; we do not will to realize them; but we should will to do so were they realizable. The psychic factor, the strain, the tension, is unmistakably present. Real desire is revealed, and common speech, as well as the language of science, recognizes the fact.