Among the stars of 20th-century psychology, Carl Gustav Jung is undoubtedly a master who cannot be overlooked. He was not only one of the most important successors of Freud’s psychoanalytic school but also a thought leader who created the system of analytical psychology. Jung introduced the concepts of “collective unconscious” and “archetypes,” extending the reach of psychology from individual experience to the common structures of the human psyche. His research spans psychology, anthropology, the history of religion, alchemy, mythology, and even art and literature, establishing a significant interdisciplinary influence in academia and the history of thought. It can be said that Jung is one of the most integrative and visionary psychological thinkers of the 20th century.
In the history of psychological development, Jung’s significance lies in his breaking away from a singular scientific path in psychology, boldly acknowledging that “the depths of the human psyche are not merely products of reason and logic; they are also filled with symbols, images, myths, and religious experiences.” This perspective has shaped not only modern psychotherapy but also influenced art, religious studies, cultural research, and even contemporary spiritual movements.
For this reason, Jung’s interest in astrology is not surprising. As the founder of archetypal psychology, he discovered during his research that astrology is a symbolic system preserved for thousands of years, structured around the twelve zodiac signs and planetary archetypes, embodying ancient humanity’s projections of self, the universe, and fate. Jung even attempted to use astrology in clinical practice; for example, he conducted statistical experiments on marriage charts and found a certain degree of “synchronicity”—which became important material for his proposal of the “principle of synchronicity.” Jung once stated, “Astrology represents the sum of ancient psychology.” In his view, astrology is not superstition but a form of collective unconscious manifested through symbols, a kind of symbolism.
Jung’s recognition allowed astrology to gradually gain a new academic context in the latter half of the 20th century. Psychologists like Dan Rudia and Liz Green, inspired by Jung’s ideas, redefined astrological charts as “psychological maps” rather than merely predictive tools. It can be said that without Jung, there would be no modern psychological astrology.
However, Jung was indeed situated in the 20th century, and his explorations were still preliminary. Entering the 21st century, with the development of psychology, structuralism, and systems thinking, we have the opportunity to establish a more systematic and structurally deep theoretical framework based on Jung’s foundation. The SPI (Symbolic Personality Integration System, commonly referred to as Depth Personality Analysis Psychological Astrology) was born in this context. SPI inherits Jung’s “archetype-symbol” approach while transcending the fragmentation of psychological astrology, proposing a model of the “three main axes” of personality structure: the will axis, the emotional axis, and the evolutionary axis. Through this structure, SPI redefines the astrological chart as a symbolic map of personality integration, moving beyond merely interpreting “the meaning of symbols” to constructing “the deep mechanisms of personality operation.”
Therefore, if Jung revealed to us the “position of symbols in the human psyche,” then SPI, based on this foundation, deeply integrates semiotics with psychological structure, developing a systematic path aimed at personality growth, fate awakening, and practical consulting. Jung elevated astrology from superstition to a symbolic system of psychology, while SPI advances psychological astrology into an operational, teachable, and verifiable science of personality integration.