Every work of art, worthy of the name, gives evidence of the action not alone of a part of a man, but of the whole man; not only of his repressed emotions, but of his intelligence and insight, and of relationships existing between his life and all the other forms of life with which his own is interwoven. Unity must prevail throughout all nature. Either we are,--altogether, and through and through, our best as well as our less good,--nothing but the expression of repressed cravings, in the sense that they or the conflicts based on them constitute the final causa vera of all progress; or else the best that is in us and also our repressed cravings are alike due to the action of a form of energy which is virtually greater than either one of them, inasmuch as it has the capacity of developing into something greater than either. This is the agency which we should preeminently study and it is best studied under conditions when, instead of being obviously subject to repression, it is most free from repression. That is, it is best studied as it appears in the thoughts and conduct of the best men, at their best, their most constructive moments. We cannot use our power of reason to deny our reason; for in so doing we affirm the very thing which we deny. Nor are we under the necessity of using our reason to affirm our reason, since that is the datum without which we cannot undertake our task. If this view is sound, what practical conclusions can we draw from it? I wish to insist on this question because it was distinctly and positively with the practical end in mind that I ventured to write this paper, and I suggest the following as a few of these conclusions. (I) We should not speak of the "Libido," in whatever sense this word is taken, as if it were a fixed quantity, like so much heat, or so much fluid, that is, as representing so much mesaurable force. One current notion which has played a very useful part in psychoanalytic work, yet is misleading in its tendency, is that the "Libido" may be likened to a river which if it cannot find an outlet through its normal channel is bound to overflow its banks and perhaps furrow out a new path. This conception is based on this same law of the conservation of energy to which reference has been made. If, however, I am right in my contention that the "Libido" is only one manifestation of an energy,-- greater than simply "vital,"--which can be studied to the best purpose only among men whose powers have been cultivated to the best advantage, then it will be seen that this conception of "Libido" as a force of definite amount is not justifiable by the facts. One does not find that love or reason is subject to this quantitative law. On the contrary, the persons whom most of us recognize as of the highest type do not love any given individual less because their love takes in another. The bond of love holds not only three, but an indefinite number.