What is of the nature of spirit and soul must be gleaned from facts belonging to the spirit and soul; we shall then know that in the living thinking which is liberated from the will, a life-germ has been discerned which passes through the gate of death, goes through the spiritual world after death, and afterwards returns again to earthly life.
Descriptions of inner, spiritual processes are much more liable to misunderstanding than descriptions of events in the physical world. Such misunderstandings arise easily because the life of the soul is in constant movement and because we fail to bear in mind that the life of the soul is very different from life in the physical world.
Acquaintance with the human kingdom is limited: between death and a new birth - and this begins immediately or soon after death - the soul has contact and can make links only with those human souls, whether still living on earth or in yonder world, with whom he has already been karmically connected on earth in the last or in an earlier incarnation.
However superficial prevailing views of heredity seem to be, it must be admitted that a person is indeed the bearer of inherited characteristics. This is the one aspect. He must often battle against these inherited traits and rid himself of them in order to bring to fulfillment the talents laid into him before he entered earthly existence.
It is the forces of the universe that make human beings fall ill. Having learnt to recognize how sun qualities and moon qualities live in plants, animals and minerals, we discover how we can find counterforces and also individual natural forces that point us towards medicines for specific internal illnesses.
By giving material expression to force-forms in space, the Greeks gave divine spiritual beings the opportunity of using these material forms. It is no figure of speech but a fact when we say that gods came down at that time into the Greek temples in order to be among human beings on the physical plane.