In the Tree of Life, therefore, is found the first attempt to connect the Ideal with the Actual. The Qabalists say, for example, that the number 7 contains the idea of Venus, and the number 8 that of Mercury, that the connecting path between 1 and 6 refers to the moon, and that between 3 and 6 to the Sign of Gemini.
Then what is the true meaning, in the category of the Real, of these planets and signs? Here again one is faced with the impossibility exact definition, because the possibilities of research are infinite; also, at any moment in any research, the one idea merges into the her and clouds the exact definition of the images. But this, of course, is the objective. These are all blind steps on the way to the real Light: when the Universe is perceived as one, yet with all its Lights, each necessary and each distinct.
The beginning of this work is, however, easy enough. One requires no more than elementary classical knowledge. Roughly taking, for a start, the natures of the planets are described by those of the gods after whom the actual bodies in heaven were named, according to the old astrological ideas of their influence on the affairs of men. The same is true, to a less extent, of the Signs of the Zodiac. There is not so much information available about their natures; but it is helpful to note which planet rules which sign, and in which sign which planets are exalted. The individual Fixed Stars do not enter into the system of the Tarot. Theory of the Tarot - The Book of Thoth - The Libri of Aleister Crowley - Hermetic Library