But the most touching testimony from the Middle Ages is the famous love story of Abélard and Héloïse. We probably possess no older document of the passionate devotion of a woman, differing in nothing from the sentiment of the present age, than the letters of Héloïse. Abélard persuaded her to take the veil and repent in a convent the sin of voluptuousness—but she knows nothing of God—her whole soul is wrapped up in her lover: "I expect no reward from God, for what I did was not done for love of Him.... I wanted nothing from you but yourself; I desired only you, not that which belonged to you; I did not expect marriage or gifts; I did not seek to gratify my desires and do my will, but yours, and well you know that I am speaking the truth! The name of wife may seem sacred and honourable to you, but I prefer to be called your mistress or even your harlot. The more I degraded myself for your sake, the more I hoped to find grace in your eyes.... I renounced all the pleasures of the world to live only for you; I kept nothing for myself but the desire to belong entirely to you." Abélard's replies are pious sermons and theological treatises; he thinks of the love of the past only as the cursed desires of the flesh, the snare in which the devil had caught them, and urges Héloïse to thank God that henceforth they are safe. "My love which entangled both of us in sin," he says in one of his letters, "deserves not the name of love, for it was naught but carnal lust. I sought in you the gratification of my sinful desires," etc. He blessed the savage crime committed on him because it saved him for ever from the sin of voluptuousness. What Héloïse loved and treasured as her sweetest memory, was to him hell and devil's work. He wrote to her almost as if in mockery: "What splendid interest does the talent of your wisdom bear to the Lord day after day! How many spiritual daughters you have borne to Him! What a terrible loss it would have been if you had abandoned yourself to the lust of the flesh, had borne, with travail, a few earthly children, while now, with joy, you bear a great number of daughters for the kingdom of Heaven. You would have remained a woman like all the rest, but now you are far exalted even above men." This correspondence plainly reveals the tragedy of the lacerated man of the Middle Ages, as compared to the never-varying woman, emerging perfect from the hands of nature. A long and toilsome road still stretches out before him; she had reached the goal, without a struggle, at the outset. How strange is this cry of a mediaeval nun: "It seems as if the world had grown old, as if all men and all living creatures had lost their freshness, as if love had grown cold not in many, but in all hearts."

What was really the final cause of the hostility to sensuousness displayed by dualistic mediaeval Christianity? Was it not contained in eroticism itself?

This hostility was based on the fact that the world knew as yet only spiritual love and its antithesis, the sexuality which man shares with the animals; the only salvation, not merely in the Christian sense, but from the point of view of every lofty conception of civilisation, lay in the victory over animalism. The contempt of and the struggle against the lower form of eroticism animating the dualistic period was absolutely consistent; asceticism represents the highest form of culture attainable by that period. (The rejection of spiritual love was an inconsistency on the part of the clergy.) The principle of personality was the fundamental principle of Christianity; this is clearly expressed by the fact that Christianity regarded the soul as the supreme value. And what is the soul but the consciousness of human personality conceived naïvely as substance? In the light of this higher intuition sensuousness was bound to appear base and degrading.

It is therefore historically correct, though essentially an error, to regard Christianity as the religion of asceticism, for the asceticism of the Middle Ages was nothing but the immature stage of the principle of personality. Directly spiritual love was no longer in opposition to sexuality, directly a synthesis had been effected, Christianity should have drawn the obvious conclusion from its fundamental principle and acknowledged love, which united the hostile elements. Protestantism did so, half-heartedly. Luther's vacillating attitude towards sexuality is typical of this indecision. At heart he could not justify sexuality; he regarded it, in the same way as did the Fathers of the Church, as an evil with which one had to make terms. His sanction of marriage was nothing but a crooked and ill-founded compromise; and as he remained at the old dualistic standpoint, it could not have been otherwise. But the moment the new sensuous-supersensuous form of love had come into existence, it behoved Christianity, as the religion of personality, to acknowledge it.

After this digression I return to the period of the inception of the third stage of love. If I were writing a history of eroticism, I should now have to describe the rococo period, a period essentially rationalistic and devoted to pleasure, a period which believed in nothing but the obvious and understood love only in the sense of sensual pleasure. If sensuality had hitherto been evil—at least theoretically—it now became obscene. Stripped of every grand and cosmic feature, it degenerated into the principal form of amusement. The eighteenth century, though instructive and interesting to the student of eroticism, produced nothing new. Under the undisputed sway of France, a period of sensuality set in, unparalleled by any other epoch in the history of the race, except, perhaps, the early oriental epoch; even the gynecocratic family of remote antiquity was openly revived by the ladies of Paris. Casanova was the sexual hero of the age (as he is to some extent the hero of our present impotent epoch). Indefatigable in the pursuit of woman and successful until old age, he was a well-bred sexualist without subtlety or depth. The Vicomte de Valmont, the hero of Choderlos de Laclos' famous and realistic novel Les Liaisons Dangereuses, an absolutely cold and cunning seducer, was its god. They were seconded by the pleasure-loving Ninon de l'Enclos, who was still desired at the age of eighty.

This ultra-refinement was followed by the loathing of civilisation and love of nature expressed by Rousseau, Werther and Hölderlin; closely allied to these passions was sentimental love, the direct precursor of our modern conception of love. Its peculiarity lay in the fact that although spiritual in its source, it yearned for psycho-physical unity, and was therefore always slightly discordant. Rousseau was the first exponent of this romantic nature cult and sentimental love of woman. He represents the sharp recoil from the frivolity of the ancien régime, and the beginning of the third stage of love. His Nouvelle Héloïse (1759) was probably the first work in which sentimental love found expression. In Goethe's Werther (1774), which is a faithful portrayal of the poet's personal feelings, it was represented more powerfully. Werther's love was purely spiritual at its inception. "Lotte is sacred to me. All desire is silent in her presence." But in the end he desires her with unconquerable passion; a dream undeceives him about the nature of his feelings, and as he clasps her in a passionate embrace he is conscious of having reached the summit of his longing. This would seem the goal of modern love, embodying all its previous stages. It is interesting to find embodiments of the extreme poles in two incidental characters; one has been driven mad by his adoring love for a woman and wanders about the fields in November to gather flowers for his queen; the other is a young peasant who kills his rival in jealous rage. But Werther himself, steering a middle-course between these two extremes, walks straight into modern love, which means death to him.

Both the New Héloïse and Werther are, sentimentally, efforts to reach the synthesis via the soul. Friedrich Schlegel, in his famous Lucinda (1799), tried the opposite way. He has been savagely attacked for it by one side and lauded to the skies by the other, and when "the emancipation of the flesh" became the motto of the day, he was glorified as a martyr. The philosopher and theologian Schleiermacher saw in Lucinda a delivery from the tyranny of centuries. "Love has become whole again and of one piece," he exclaims, joyfully calling the poem "a vision of a future world God knows how distant." "Love shall come again; a new life shall unite and animate its broken limbs; it shall rule the hearts and works of men in freedom and gladness, and supersede the lifeless phantoms of fictitious virtues." Schleiermacher also voiced the idea of the synthesis: "And why should we be arrested in this struggle (i.e., between love as the flower of sensuousness and the intellectual mystical component of love), when in all domains we are striving to bring the ideas, born by the new development of humanity, into harmony with the result of the work of past ages?" His Confidential Letters on Schlegel's Lucinda have made the Protestant pastor Schleiermacher the philosopher of the third stage of eroticism, as the chaplain Andreas was the theorist of the second. The third stage gained its first footing amongst the German romanticists. Women were largely instrumental in achieving its victory. I will not go into detail but will confine myself to mentioning in passing the names of Jean Paul, Henrietta Herz, Brentano, Sophy Mereau, Dorothy Vest, Schelling, Friedrich Gentz. W. von Humboldt records a conversation which he had in the year of the Revolution with Schiller. The latter unhesitatingly professed his faith in the unity of love. "It (the blending of love and sensuality) is always possible and always there." But Humboldt was diffident, unable fully to grasp the new conception. "I said that it would sever the most beautiful, most delicate relationships, that it was too heterogeneous to admit of coherence; but my principal argument was that in the majority of cases it was out of the question...."

There is a document from the year 1779 which contains in its entirety the modern conception of harmonious love, together with its ecstatic apotheosis, the love-death, a document which puts the later theorising romanticists and Lucinda completely in the shade. I am referring to the only one of Gottfried August Bürger's letters to Molly, which has been preserved. It contains the following passages: "I cannot describe to you in words how ardently I embrace you in the spirit. There is in me such a tumult of life that frequently after an outburst my spirit and soul are left in such weariness that I seem to be on the point of death. Every brief calm begets more violent storms. Often in the black darkness of a stormy, rainy midnight, I long to hasten to you, throw myself into your arms, sink with you into the infinite ocean of delight and—die. Oh Love! oh Love! what a strange and wonderful power art thou to hold body and soul in such unbreakable bonds!... I let my imagination roam through the whole world, yea, through all the heavens and the Heaven of heavens, and examine every delight and compare it to you, but by the Eternal God! there is nothing I desire so ardently as to hold you, sweetest and heavenliest of all women, in my arms. If I could win you by walking round the earth, naked and barefoot, through thorns and thistles, over rocks and snow and ice, and, on the point of death, with the last spark of life, sink into your arms and draw new life and happiness from your loving bosom, I should consider that I bought you for a trifle."

To adduce more historical evidence of modern love would serve no purpose; in the next chapter I shall discuss its metaphysical consummation, the love-death. But I will briefly point out the not quite obvious difference between synthetic love and sexuality projected on a specific individual. In several of the higher animals the sexual instinct is to some extent individualised, but nevertheless it is no more than instinct, seeking a suitable mate for its gratification. All the well-known theories of "sexual attraction," from Schopenhauer to Weininger, accounting love as nothing but a mutual supplementing of two individuals for the purpose of the best possible reproduction of the species, do not apply to love in the modern sense, but to the sexual impulse; they completely disregard the individual, and are only aware of the species; they apprehend individualisation as an instrument in the service of the race. But genuine personal love is not kindled by instinct; it is not differentiated sexual impulse; it embraces the psycho-physical unity of the beloved without being conscious of sexual desire. It shares with the purely spiritual love the eagerness of man to raise and glorify the beloved woman, without ulterior motive or desire. This distinction may be called hair-splitting, and I admit that it is frequently impossible to make it in practice, but it is important in principle because it goes back to origins and finds in the metaphysical climax of the third stage, the love-death, its practical anti-generic proof. But with all this it is of common occurrence that spiritual and sensual love are at different times projected on one and the same woman.

Schopenhauer's instinct of philoprogenitiveness has to-day become an article of faith with the learned and unlearned. Schopenhauer was the first, probably, to conceive the idea that love was the consciousness of the unconscious instincts in the service of the species, and had no other content or purpose than the will of the species to produce the best possible offspring. In a chapter of his principal work, entitled The Metaphysics of Love, he essayed to promulgate and prove his theory in detail. "All love, however ethereal it may pretend to be, is rooted solely in the sexual instinct; it is nothing more nor less than specialised, strictly speaking individualised, sexual desire." Schopenhauer's conception of love does not rise above this specialised impulse. He calmly ignores all phenomena such as those I have described because they do not fit his theory. With the exception of his cheap observation that contrasts attract each other (which is the pith of all his "truths") he does not adduce the smallest evidence for the truth of his myth of "the genius of the species spreading his wings over the coming generation." However much the results of breeders may be applicable to the human species, they have nothing to do with love, and the believers in the theory of the instinct of philoprogenitiveness are silent on the subject of the best and most suitable subject for the purpose; is it the law-abiding citizen? the restless reformer? or the artist and thinker? Strange to say, the legend of the instinct of philoprogenitiveness, intuitively conscious of the right way, is to-day accepted even by scientists who are in sympathy neither with Schopenhauer's nor with any other metaphysic. It is taken for granted that love can only serve the purpose of the species; the fact that this theory is both metaphysically and scientifically unsound is ignored. For even leaving the genius of the species out of the question, his intelligent comprehension of the "composition of the next generation" is nevertheless devoutly believed in. Even Nietzsche, that arch-individualist, was completely under the spell of this dogma, as is proved by many of his utterances, for instance, by the well-known socialistic definition of marriage as "the will of twain to create that which is higher than its creators," and also by his theory that man is not an end in himself but a bridge to something else. Nietzsche's pronouncement that he has not yet found the woman whom he would like to be the mother of his children, echoes the philosophy of Schopenhauer, the superstition of the genius of philoprogenitiveness. The intrinsic worth of love without any ulterior motive, without a view to pleasure or to offspring, seems to have been unknown to Nietzsche. Schopenhauer's hero puts the purport of love not in the actual individual, but in a conception, and annihilates the value of the individual and the unique. Every great emotion is an end in itself, and whatever we may read into it of "purposes" and "expediencies," is an invention, and independent of the emotion itself. The aim of the purely spiritual love of the second stage was not propagation, and yet it was an emotion whose loftiness cannot easily be surpassed. With the deification of woman love reached far beyond the beloved into infinitude, and the phenomenon of the love-death renders all the supposed generic purpose of love impossible. But even if we ignored love altogether and admitted the existence of the sexual instinct only, its mysterious endeavour in the interest of the species would still remain pure imagination, and a conception far inferior to that of the winged god of love. The instinct does not possess a trace of "discretion," takes no interest in the weal and woe of humanity, but is utterly selfish, seeking its own gratification and nothing else.