It was not till fairly late that the Greeks succeeded in separating the idea of woman and that of generation; but they had already disassociated, at a very early date, the idea of generation and that of carnal pleasure. When they ceased to consider woman solely as an instrument of generation, the reign of the courtesans began. The Greeks seem, moreover, always to have had an extremely vague sexual morality, though this did not prevent them from cutting a certain figure in history.
Christianity could not, without forswearing its own principles, encourage the disassociation of the idea of carnal pleasure and that of generation; but it successfully promoted, on the other hand, the disassociation of the idea of love and that of carnal pleasure, and this was one of the great conquests of humanity. The Egyptians were so far incapable of understanding such a disassociation, that the love of a brother and sister would have seemed nothing to them if it had not led to sexual intercourse. The lower classes of great cities are often enough quite Egyptian in this regard. The different sorts of incest which occasionally come to our notice, testify to the fact than an analogous state of mind is not absolutely incompatible with a certain intellectual culture. The peculiarly Christian form of chaste love, freed from all idea of physical pleasure, is divine love, such as it is seen flowering in the mystical exaltation of the contemplatives. This is the really pure love, since it corresponds to nothing that can be defined. It is the intelligence adoring itself in its own infinite self-made image. Whatever sensual element may be involved has its source in the very constitution of the human body, and in the law governing the interdependence of the organs. No account should, therefore, be taken of it in a non-physiological study. What has been clumsily called Platonic love is thus a Christian creation. It is in the last analysis a passionate friendship, as vital and jealous as physical love, but freed from the idea of carnal pleasure, just as the latter had already been freed from the idea of generation. This ideal state of the human affections is the first stage on the road to asceticism, and asceticism might be defined as the state of mind in which all ideas are disassociated.