At a given time an architectural style is created, born out of the great ideas of initiates. Human souls take up the force of these forms. Centuries go by. What the soul has absorbed through its contemplation of building forms appears in the mood of his soul. Ardent souls will then come into existence, souls who look up to the heights. Even when the course was not always quite as I have described it, still like effects showed themselves often in human development.
Now let us follow these people some millennia further. Those who absorbed the forces of the forms of these buildings into their souls show the expression of their inner soul configurations in their countenances. The entire human shape forms itself through such impressions. What was built thousands of years ago, appears to us in human countenances thousands of years later. Thus, one recognizes why such arts were practiced. Initiates look out into the far future and see how human beings are meant to become. Hence it is that at a definite time, they form external building styles, outer art forms, on a large scale. So it is that the germ of future human epochs is laid.
Source: Rudolf Steiner – GA 101 – Occult Signs and Symbols: Lecture II – Stuttgart, 14th September 1907