(1) "When we study the threefold human form in its relation to the Cosmos, we can say that man is shaped and moulded by cosmic forces but these forces work upon him in many different ways. The changing position of the Sun in the zodiacal constellations through the various epochs has been taken as an indication of the different forces which pour down to man from the world of the fixed stars." -Rudolf Steiner, Cosmic Forces in Man, GA 209, 1. Cosmic Forces in Man

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(2) "...the changes on the earth are closely connected with certain constellations of the stars. This is a most significant fact. At the beginning of spring the sun rises in a certain zodiacal constellation. The sun began to rise in the constellation of Aries (the Ram) 800 years before Christ; before that epoch it rose in the adjacent constellation of Taurus (the Bull). About 2,600 years are required for the passage through one constellation. The circuit through the whole twelve constellations is known in occultism as a Cosmic Year." -Rudolf Steiner, Theosophy of the Rosicrucian, GA 99, V. Man's Communal Life Between Death and a New Birth. Birth into the Physical World. https://rsarchive.org/Lectures/GA099/English/RSP1966/19070529p01.html

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(3) "... all astrological Mysteries in ancient time were in reality Mysteries of Light, — in the times, I mean, before the arrival of the Mystery of Golgotha. Only, here again we must remember that the ancient Astrology was not pursued with the abstract calculations of to-day, but with an atavistic clairvoyant power. Man did not merely observe the mineral-physical world of stars above him; in those most ancient times, he had an organ with which to behold the secret of the constellations. It was, especially, a customary art in certain Mysteries of olden time, to observe the Moon establishing its various positions through the constellations of the Zodiac...

 

Likewise the other planets in their several constellations were brought home to the consciousness of men...

 

They knew, moreover, that the Mystery of human death is connected with what is thus spoken to man by the starry constellations. Throughout the ever-changing association of the fixed stars with the several planets, they saw the expression, as it were, of a language which he who sojourns in the body hears from the Earth, while at the same time the souls of the dead perceive it from the other side. They were clearly conscious of the fact that when a man gives himself up with devotion to the language of the stars, he lives in that element which receives the human being when he passes through the Gate of Death." -Rudolf Steiner, On the Mysteries of Ancient and Modern Times, GA 180, III. Realities Beyond Birth and Death https://rsarchive.org/Lectures/GA180/English/AM1929/19171229p01.html *This is an abridged quote.

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(4) As a rule the ancient rites of initiations were conducted so that the soul-expansion of one Initiate was directed to the macrocosmic secret, say of Capricorn, another to those of Cancer, of the Balance, and so on. I have explained on other occasions that there are twelve different possible ways of expansion into the Macrocosm, and that these are indicated symbolically by the twelve signs of the Zodiac. Anyone attaining initiation through expansion of his soul into the macrocosm, and who does not attain at once to the highest—the Sun initiation—but only to a partial initiation, would have his soul-vision directed to the mysteries connected with some special constellation. -Rudolf Steiner,  Excurses on the Gospel of Mark, GA 124, Part III. Excursus, Lecture II, Part III. Excurses - Lecture II - Vol. 124. Excurses on the Gospel of Mark (1937) - Rudolf Steiner Archive