Lecture III
All this was necessary in order that that body might be produced which received the baptism of St. John in the Jordan. At that moment the individuality of Zarathustra left the threefold body, the physical, the etheric and the astral body of that Jesus Who had grown up in so complicated a manner, in order that the spirit of Zarathustra might be able to dwell in Him. The reincarnated Zarathustra had to pass through two possibilities of development which were given in the two Jesus children. Thus there stood before the Baptist the body of Jesus of Nazareth and in it from that time onwards there acted the cosmic individuality of the Christ. Now, as we have shown, in the case of any other human being, the cosmic spiritual laws work upon him only in so far as they give him a start in earth-life. Afterwards there appear in opposition to these laws, others which arise out of the conditions of the earth-evolution. In the case of the Christ-Jesus, after the baptism of John the cosmic-spiritual forces alone remained effective without being influenced in any way through the laws of the earth evolution.
Cite:
GA 15/l03/p018 · edition ASGB1921