This description makes it manifest that the two types go contrary ways in the course of the development of their unconscious, arriving therefore at opposite extremes: the one at the idea, the other at the object of his feeling. The psychological characteristics of the types are eventually pushed to extremes, where according to the enantiodromic law the moment has arrived when in each case the "other" function enters into its fully acknowledged right, that is, feeling in the case of the introvert, and thought in that of the extrovert. The introvert attains the lacking function of autonomous feeling by means of a differentiation and enhancement of his thought; whilst the extrovert, on the other hand, attains his thinking by the way of an increasingly differentiated love. These functions that hitherto were secondary are found at first in the unconscious, gradually reaching consciousness in the course of development. At first they are unconscious functions in a state that is more or less incompatible with consciousness and have the typical qualities of unconscious contents. These qualities are such as are not tolerated in consciousness. The lunatic Schreber[248] says most aptly that the language of God (the unconscious) is a somewhat archaic but vigorous German, of which he gives a few striking examples. As the contrary function that emerges from the unconscious into consciousness differs to such an extent from what appears to be acceptable to consciousness, the necessity arises of a technique for coming to terms with the contrary function. It is impossible to accept the contrary function as it stands, as it always drags extraneous qualities and accompanying circumstances with it from the absolute unconscious. Through the above-described development the extrovert has acquired an adaptation to the object that is absolutely real and free from all phantasies; he will therefore be able to turn his attention towards the "alloy" which for the introvert was the valuable germ of idea. From this he will then develop similar ideas to those which the introvert has already developed. Vice versâ, the introvert will now be able to turn his attention to those materials which before he was obliged to reject, as being side-tracks on the road to physical reality; that is, he will carry out the same clearing and winnowing in his feeling-relations, that the extrovert has already completed.

The development of the contrary function that was hitherto unconscious, leads to individuation beyond the type, and thereby to a new relation to the world and mind. The process which begins with the complementation of the types is the transcendental function, which leads to the new adaptation by means of the clearing and winnowing of unconscious feelings and thoughts that have been brought up by the contrary function that had been neglected.

Following the old maxim: "naturam si sequemur ducem nunquam aberrabimus," we have obeyed the natural impulse of the thinker to carry the principle of thought through to its utmost perfection attainable, as also that of the feeler, of carrying the principle of feeling through to the end. By these means the salutary extreme was produced, to wit, the hunger, the desire for the compensatory function. For, by means of thought, the one is landed in a lifeless ice-cold world of crystalline ideas; whereas, by means of feeling, the other reaches a limitless ocean of never ending flood of sentiment. The former will, therefore, yearn for living warmth of feeling, and the latter for the restrictive precision and solidity of thought.

An enrichment of the individual is attained by this compensatory process, giving him greater decision and the possibility of a harmony that is complete in itself. The assimilation of the contrary function discloses new inner springs, which guarantee to the individual considerably greater independence from external conditions. This acquisition is an indisputable advantage that none would like to surrender in face of the fact so unavoidably connected with it, that a new adaptation and orientation of this kind places the individual in a certain contrast to the great bulk of people who yet have the old attitude. This contrast is no drawback; it is rather a welcome and effective spur to life and work, for thereby is created the channel required by our psychic energy for its development.

XI.—General Remarks on the Therapy.

I have still to draw the reader's attention to an important fact. Throughout the course of this paper, I have seemed to associate the idea of disturbance or even of peril with the unconscious. But it would give a false impression if we were only to emphasize the dangerous side of the unconscious. The unconscious is a source of danger when the individual is not at one with it. If we succeed in establishing the function or attitude that I call transcendental, the disharmony ceases, and we are permitted to enjoy the favourable side of the unconscious. In such case the unconscious vouchsafes us that furtherance and assistance which bountiful Nature is always ready to give to man in overflowing abundance. The unconscious possesses possibilities of wisdom that are completely closed to consciousness, for the unconscious has at its disposal not only all the psychic contents that are under the threshold because they had been forgotten or overlooked, but also the wisdom of the experience of untold ages, deposited in the course of time and lying potential in the human brain. The unconscious is continually active, creating combinations of its materials; these serve to indicate the future path of the individual. It creates prospective combinations just as our consciousness does, only they are considerably superior to the conscious combinations both in refinement and extent. The unconscious may therefore be an unparalleled guide for human beings.

The reader must on no account suppose that the complicated psychological changes described must all be passed through in every individual case. In practice the treatment is adjusted according to the therapeutic result attained. The particular result arrived at may be reached at any stage of the treatment, quite apart from the seriousness or duration of the malady. The treatment of a serious case may last a long time, without the higher phases of the evolution ever being reached, or needing to be reached. There are comparatively few people who, after attaining the desired therapeutical result, pursue the further stages of evolution for the sake of their own development. It is, therefore, not the seriousness of the case which obliges one to pass through the whole development. In any case, only those people attain a higher degree of differentiation who are by nature destined and called to it, that is, who have both a capacity and tendency towards the higher differentiation. This is a matter in which people are extremely different, just as among species of animals there are some that are stationary and conservative, and others that are evolutionary. Nature is aristocratic, but not in the sense of having reserved the possibility of differentiation exclusively for those species that stand high. Similarly, the possibility of the psychological development of human beings is not reserved for specially gifted individuals. In other words: neither special intelligence nor any other talent is necessary in order to achieve a far-reaching psychological development, inasmuch as in this development moral qualities step in to supplement where intellect does not suffice. But it must not be supposed under any circumstances that the treatment consists in grafting general formulas and complicated doctrines on to people; this is not so. Each one can acquire that which he needs, after his own fashion and in his own language. What I have here presented is only the intellectual formulation of the subject, founded upon preliminary scientific study of an empirical as well as a theoretical nature; but this formulation does not become a subject of discussion in the ordinary practical analytical work. The brief notes of cases that I have inserted give an approximate idea of the practical side of analysis.

The reader should realize that our new understanding of psychology has a side that is entirely practical, and another that is entirely theoretical. It is not merely a practical method of treatment or education, but it is also a scientific theory, that is closely related to other co-ordinated sciences.

Conclusion.

In conclusion, I must beg the reader to pardon me for having ventured to say so many new and abstruse things in such a brief compass. I lay myself open to adverse criticism, because I conceive it to be the duty of every one who isolates himself by taking his own path, to tell others what he has found or discovered, whether it be a refreshing spring for the thirsty, or a sandy desert of sterile error. The one helps, the other warns. Not the opinion of any individual contemporary will decide the truth and error of what has been discovered, but rather future generations and destiny. There are things that are not yet true to-day, perhaps we are not yet permitted to recognize them as true, although they may be true to-morrow. Therefore every pioneer must take his own path, alone but hopeful, with the open eyes of one who is conscious of its solitude and of the perils of its dim precipices. Our age is seeking a new spring of life. I found one and drank of it and the water tasted good. That is all that I can or want to say. My intention and my duty to society is fulfilled when I have described, as well as I can, the way that led me to the spring; the reproaches of those who do not follow this way have never troubled me, nor ever will. New ideas always encounter resistance from the old. That always was and always will be the case; it appertains to the self-regulation of mental progress.