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 naively 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.