Referee Margarita - Dane Rudhyar's Astrology. Aphorisms and Rules of Life стр 3.

12 An astrological chart can be understood as a kind of chemical formula in which planets and the like represent the simple and basic "elements" which, in their varied combinations, are the subject-matter of the "chemistry" of personality.

At the same time, an astrological chart is not exactly a "formula", it resembles a musical score in many ways. You can not understand it with intelligence only: an astrological chart must be felt as a living symbol of the Universe. To feel it, you need to use your creative imagination and intuition.