"The more the ego strives for the highest point of its evolution, the more it works into the Zodiac. There is nothing that happens in the innermost core of the ego that has not its consequences right up to the very Zodiac. And inasmuch as man with his ego lays the foundations for his development to Atman, or Spirit Man, he develops, stage by stage, the forces which enable him to work upwards into the sphere of Libra, the Balance, in the Zodiac. He will attain full power over Libra in the Zodiac when his ego has developed to Atman, or Spirit Man. He will then be a being from whom something streams out, who has passsed out of the sphere of Time into the sphere of Duration, of Eternity."
--Rudolf Steiner, The Influence of Spiritual Beings upon Man, pp. 31-32