Conditions of Desire.—Desire is a feeling simple and indefinable. We can merely specify the conditions which it observes, and the occasions on which it is awakened. These conditions or occasions are the two already mentioned; the previous enjoyment, in some degree, of an agreeable object, and the present or contemplated absence of that object. Where these conditions are fulfilled, desire springs up at once in the mind, a desire proportioned to the degree of that previous enjoyment, and the strength of the affection thereby awakened in our minds for the object of our regard.
Opposite of Desire, Aversion.—The opposite of desire is aversion, the feeling that arises in view of an object not as agreeable but as disagreeable, not as a good but as an ill. This, too, like desire, is based upon some measure of experience; we have suffered somewhat of real or imagined ill, which, while it continues, is an object of dislike or hatred, and regarded as something which, though now absent, may possibly be realized in the future, becomes an object of aversion. Aversion, as well as its opposite, desire, finds its object in the future, while its basis lies in the past.
It will not be necessary to treat particularly of our aversions as a distinct class of emotions, since they are, for the most part, simply the counterparts of our desires, the desire of life, or happiness, having its equivalent in the aversion which we feel to suffering, and to death; so of other desires.
Desire always preceded by Emotion.—With regard to the nature of desires, it may further be remarked that while they imply always an object, an agreeable object, and that an absent one; while they imply, also, some previous enjoyment of that now absent object, or, at least, some knowledge of its existence and adaptation to our wants, as the foundation on which they rest, they do not take their rise immediately from the simple perception or intellectual contemplation of that absent object, as presented again merely to thought or imagination, but always some emotion or affection is first awakened by such thought or perception, and the desire succeeds to, and springs out of, that emotion. The mere perception of the object which formerly pleased me, does not, of itself, awaken in me immediately a desire for the object, but first an emotion or affection, and from that arises the desire.
Permanence of the Desires.—The greater permanence which our desires seem to possess, as compared with other simple emotions and affections, and which has been sometimes regarded as a distinguishing characteristic of this class of feelings, is owing, probably, not so much to the nature of desire, in itself considered, as to the fact that the object desired is always an absent object, and so long as it so remains, the desire for it is likely to continue. Were our desires always gratified as soon as they are definitely known, they would be no more permanent than any other state of mind.
Desire a motive Power.—The desires, it is to be noticed, moreover, are, in their nature, motive powers, springs of action to the mind. They are, if not the only, at least the chief source of mental activity. They prompt and excite the mind to action. The faculties, both physical and mental, are, in a manner, subject to their control. The intellect itself leads not to action; nor do the emotions; they agitate the mind, but it is only as they awaken desire, and that desire fixes upon a definite object, possible, but not in possession, that mind and body are both aroused to go forth for the attainment of the absent object of desire.
Classification of Desires.—Our desires may be classed according to their objects. These are of two sorts or classes: those which pertain to the physical nature and constitution, and those which relate to the wants of the mind rather than of the body. The desires, accordingly, may be classed as twofold—the animal, and the rational; the former having their source in the physical constitution of man, the latter in the nature and wants of the mind, rather than of the body. Of the former class are the desire of food, of sex, of exertion, of repose, of whatever, in a word, is adapted to the animal nature and wants. Of the latter class, the more prominent are the desire of happiness, of knowledge, of power, of society, of the esteem of others.
In connection with our desires are to be considered also those emotions which are known under the name of hope and fear, and which, as was stated in our previous analysis of the sensibilities, are to be regarded rather as modifications of desire, than as distinct principles or modes of mental activity.