Apart altogether, however, from the question of its effectiveness, or even of the misery that it causes to all concerned, it is evident that jealousy is incompatible with all the tendencies of civilization. We have seen that a certain degree of variation is involved in the sexual relationship, as in all other relationships, and unless we are to continue to perpetuate many evils and injustices, that fact has to be faced and recognized. We have also seen that the line of our advance involves a constant increase in moral responsibility and self-government, and that, in its turn, implies not only a high degree of sincerity but also the recognition that no person has any right, or indeed any power, to control the emotions and actions of another person. If our sun of love stands still at midday, according to Ellen Key’s phrase, that is a miracle to be greeted with awe and gratitude, and by no means a right to be demanded. The claim of jealousy falls with the claim of conjugal rights.
It is quite possible, Bloch remarks (The Sexual Life of Our Time, Ch. X), to love more than one person at the same time, with nearly equal tenderness, and to be honestly able to assure each of the passion felt for her or him. Bloch adds that the vast psychic differentiation involved by modern civilization increases the possibility of this double love, for it is difficult for anyone to find his complement in a single person, and that this applies to women as well as to men.
Georg Hirth likewise points out (Wege