Stages of downward penetration of divine nature into a human individuality

Now recall the oft-repeated facts of the development of a single personality; how the physical body evolves in the first seven years; the etheric in the next seven, between the change of teeth and puberty; and the astral only begins its free development at the age of fourteen. The development of the physical body and etheric body as these passed down through the generations from Abraham, was destined to come to an end, and entered on a new existence when it became the dwelling-place of Zarathustra. But when he had completed the development of the etheric body, that which had been prepared for him no longer sufficed, and he had then to proceed to the development of the astral body. Mighty and amazing events brought this to pass, events which if we have no understanding of them make it impossible for us to grasp the full meaning of the great Mystery of Jesus Christ.