The book explores the connections between astrology and psychology, discussing how astrology can be used to align individual talents with cosmic life laws. To this end, Arroyo translates the four elements—the traditional fundamental concepts of astrology—into four types of psychic energy and describes how each person resonates with a different (personal) energy. Arroyo also relates the effects of aspects back to the elements, which he considers crucial factors for a successful horoscope comparison. This horoscope comparison is essential for our social existence. The book also includes a keyword system on houses and elements, as well as excursions on astrology and modern energy research, and astrology and polarity therapy.