The vital point, the point of intersection and of change in the ascending life of man, lies at the time of the separation of the sexes. There was an age when the two sexes were united in the being of man. Even Darwin recognised this as a probability. As the result of the separation of the sexes, a new, all-embracing element came to birth: the element of love. The attraction of love is so powerful, so mysterious, that tropical butterflies of different sexes, brought to Europe and then released to the air, will fly back again and meet each other half-way.
Source: Rudolf Steiner – GA 94 – An Esoteric Cosmology – III – God, Man, Nature – Paris, 27th May 1906
Translated by Rene Querido