Lecture V
During the Moon period it was not possible for all the Beings connected with it to maintain the same rate of progress in their development. It was not only during the development of our Earth, but also earlier, during the Moon development, that the Sun separated off from the common world-body; so that in the middle of the Moon period we have two spheres—the Moon (earth plus moon) and the Sun, which as you know had departed along with the most advanced of the Spiritual Beings. Through the withdrawal of the finer forces and higher Beings the grosser had been left behind upon the Moon; this planet therefore (Earth plus Moon) began to densify and harden. You must realize that even during the ancient Moon period the Sun with its Beings worked for a time from outside upon the backward Moon-body.