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.