The following passages are extracted from the Rudolph Steiner Archive:
“Egyptian Myths and Mysteries (GA 106) Lecture 10 12 September 1908, Leipzig”
Here we come to a significant concept of esoteric Christianity, which can show us how this Christianity is permeated with the highest truths. We come to the remainder of what confronts us in the Baptism. Through the fact that the Christ-being took possession of the three bodies (physical, astral and etheric) in which the ego-being of Jesus formerly abode, a Being was bound up with the Earth that had earlier had its dwelling-place on the Sun. It had formerly been bound up with the Earth until the moment when the Sun departed from the Earth.
At that time the Christ also departed, and from then on he could exercise his power upon the Earth only from outside, in the moment of the Baptism, the high Christ-spirit again united himself in the full sense with the earth. Formerly he worked from outside, overshadowing the prophets and working in the mysteries. Now he was actually incarnated in a physical human body on the Earth. […]
A new force was implanted in the Earth. What earlier had worked from without, again became united with the Earth, and thereby the attractive power between Sun and Earth will grow so strong that Sun and Earth will again unite, and man will unite with the Sun-spirits. It was the Christ who gave the possibility that the Earth can again unite with the Sun and be in the bosom of the Godhead.
In closing I add a link to my Easter Message from four years ago.