All discussions on the nature of genius are either biological-clinical, and serve only to show the absurd presumption of present knowledge of this kind in its hope to solve a problem so difficult; or they descend from the heights of a metaphysical system for the sole purpose of including genius in their purview. If the road that I am about to take does not lead to every goal at once, it is only because that is the nature of roads.

Consider how much deeper a great poet can reach into the nature of man than an average person. Think of the extraordinary number of characters depicted by Shakespeare or Euripides, or the marvellous assortment of human beings that fill the pages of Zola. After the Penthesilea, Heinrich von Kleist created Kätchen von Heilbronn, and Michael Angelo embodied from his imagination the Delphic Sibyls and the Leda. There have been few men so little devoted to art as Kant and Schelling, and yet these have written most profoundly and truly about it. In order to depict a man one must understand him, and to understand him one must be like him; in order to portray his psychological activities one must be able to reproduce them in oneself. To understand a man one must have his nature in oneself. One must be like the mind one tries to grasp. It takes a thief to know a thief, and only an innocent man can understand another innocent man. The poseur only understands other poseurs, and sees nothing but pose in the actions of others; whilst the simple-minded fails to understand the most flagrant pose. To understand a man is really to be that man.

It would seem to follow that a man can best understand himself—a conclusion plainly absurd. No one can understand himself, for to do that he would have to get outside himself; the subject of the knowing and willing activity would have to become its own object. To grasp the universe it would be necessary to get a standpoint outside the universe, and the possibility of such a standpoint is incompatible with the idea of a universe. He who could understand himself could understand the world. I do not make the statement merely as an explanation: it contains an important truth, to the significance of which I shall recur. For the present I am content to assert that no one can understand his deepest, most intimate nature. This happens in actual practice; when one wishes to understand in a general way, it is always from other persons, never from oneself, that one gets one’s materials. The other person chosen must be similar in some respect, however different as a whole; and, making use of this similarity, he can recognise, represent, comprehend. So far as one understands a man, one is that man.

The man of genius takes his place in the above argument as he who understands incomparably more other beings than the average man. Goethe is said to have said of himself that there was no vice or crime of which he could not trace the tendency in himself, and that at some period of his life he could not have understood fully. The genius, therefore, is a more complicated, more richly endowed, more varied man; and a man is the closer to being a genius the more men he has in his personality, and the more really and strongly he has these others within him. If comprehension of those about him only flickers in him like a poor candle, then he is unable, like the great poet, to kindle a mighty flame in his heroes, to give distinction and character to his creations. The ideal of an artistic genius is to live in all men, to lose himself in all men, to reveal himself in multitudes; and so also the aim of the philosopher is to discover all others in himself, to fuse them into a unit which is his own unit.

This protean character of genius is no more simultaneous than the bi-sexuality of which I have spoken. Even the greatest genius cannot understand the nature of all men at the same time, on one and the same day. The comprehensive and manifold rudiments which a man possesses in his mind can develop only slowly and by degrees with the gradual unfolding of his whole life. It appears almost as if there were a definite periodicity in his development. These periods, when they recur, however, are not exactly alike; they are not mere repetitions, but are intensifications of their predecessors, on a higher plane. No two moments in the life of an individual are exactly alike; there is between the later and the earlier periods only the similarity of the higher and lower parts of a spiral ascent. Thus it has frequently happened that famous men have conceived a piece of work in their early youth, laid it aside during manhood, and resumed and completed it in old age. Periods exist in every man, but in different degrees and with varying “amplitude.” Just as the genius is the man who contains in himself the greatest number of others in the most active way, so the amplitude of a man’s periods will be the greater the wider his mental relations may be. Illustrious men have often been told, by their teachers, in their youth “that they were always in one extreme or another.” As if they could be anything else! These transitions in the case of unusual men often assume the character of a crisis. Goethe once spoke of the “recurrence of puberty” in an artist. The idea is obviously to be associated with the matter under discussion.

It results from their periodicity that, in men of genius, sterile years precede productive years, these again to be followed by sterility, the barren periods being marked by psychological self-depreciation, by the feeling that they are less than other men; times in which the remembrance of the creative periods is a torment, and when they envy those who go about undisturbed by such penalties. Just as his moments of ecstasy are more poignant, so are the periods of depression of a man of genius more intense than those of other men. Every great man has such periods, of longer or shorter duration, times in which he loses self-confidence, in which he thinks of suicide; times in which, indeed, he may be sowing the seeds of a future harvest, but which are devoid of the stimulus to production; times which call forth the blind criticisms “How such a genius is degenerating!” “How he has played himself out!” “How he repeats himself!” and so forth.

It is just the same with other characteristics of the man of genius. Not only the material, but also the spirit, of his work is subject to periodic change. At one time he is inclined to a philosophical and scientific view; at another time the artistic influence is strongest; at one time his intervals are altogether in the direction of history and the growth of civilisation; later on it is “nature” (compare Nietzsche’s “Studies in Infinity” with his “Zarathustra”); at another time he is a mystic, at yet another simplicity itself! (Björnson and Maurice Maeterlinck are good modern examples.) In fact, the “amplitude” of the periods of famous men is so great, the different revelations of their nature so various, so many different individuals appear in them, that the periodicity of their mental life may be taken almost as diagnostic. I must make a remark sufficiently obvious from all this, as to the existence of almost incredibly great changes in the personal appearance of men of genius from time to time. Comparison of the portraits at different times of Goethe, Beethoven, Kant, or Schopenhauer are enough to establish this. The number of different aspects that the face of a man has assumed may be taken almost as a physiognomical measure of his talent.[9]

[9] I cannot help using the word “talent” from time to time when I really mean genius; but I wish it to be remembered that I am convinced of the existence of a fundamental distinction between “talent,” or “giftedness,” and “genius.”

People with an unchanging expression are low in the intellectual scale. Physiognomists, therefore, must not be surprised that men of genius, in whose faces a new side of their minds is continually being revealed, are difficult to classify, and that their individualities leave little permanent mark on their features.

It is possible that my introductory description of genius will be repudiated indignantly, because it would imply that a Shakespeare has the vulgarity of his Falstaff, the rascality of his Iago, the boorishness of his Caliban, and because it identifies great men with all the low and contemptible things that they have described. As a matter of fact, men of genius do conform to my description, and as their biographies show, are liable to the strangest passions and the most repulsive instincts. And yet the objection is invalid, as the fuller exposition of the thesis will reveal. Only the most superficial survey of the argument could support it, whilst the exactly opposite conclusion is a much more likely inference. Zola, who has so faithfully described the impulse to commit murder, did not himself commit a murder, because there were so many other characters in him. The actual murderer is in the grasp of his own disposition: the author describing the murder is swayed by a whole kingdom of impulses. Zola would know the desire for murder much better than the actual murderer would know it, he would recognise it in himself, if it really came to the surface in him, and he would be prepared for it. In such ways the criminal instincts in great men are intellectualised and turned to artistic purposes as in the case of Zola, or to philosophic purposes as with Kant, but not to actual crime.