Born on July 26, 1875, in Kesswil, Switzerland, Carl Gustav Jung grew up in an environment steeped in mysticism and religion (his father was a pastor). A solitary and introspective child, he developed a rich inner life early on, marked by intense dreams and visions that would shape his entire oeuvre.
Fascinated by the natural sciences yet torn by his attraction to philosophy and the history of religions, he ultimately chose medicine. He specialized in psychiatry, a nascent discipline he considered the ideal bridge between nature (the body, the brain) and the spirit (the soul).
In 1907, Jung met Sigmund Freud in Vienna. It was the beginning of an intense collaboration. Freud saw in Jung his 'crown prince' and the natural successor to lead the psychoanalytic movement. However, profound theoretical divergences quickly emerged.
Jung refused to reduce all psychic dynamics to repressed sexuality alone. He intuited the existence of a much vaster dimension of the unconscious, which was not merely a dumping ground for unacknowledged desires, but a universal creative matrix. In 1913, the break was consummated with the publication of 'Transformations and Symbols of the Libido'. Jung was exiled from the Freudian circle.
Following this rupture, Jung underwent a period of profound disorientation, which he described as a 'confrontation with the unconscious'. For several years, he recorded his dreams, visions, and inner dialogues in the famous 'Red Book' (Liber Novus), an illuminated manuscript he kept secret for most of his life.
It was from this descent into the abyss of his own psyche that his major concepts would emerge: the Collective Unconscious, archetypes, and individuation. He regularly retreated to his tower in Bollingen, built with his own hands, to meditate and write in close communion with nature.
In the early 1920s, Jung discovered the Yi King through the translation by his sinologist friend Richard Wilhelm. Fascinated, he spent an entire summer experimenting with the Chinese oracle using yarrow stalks.
This discovery was fundamental: Jung observed that the casting, though lacking any rational physical cause, responded with astonishing precision to the psychological state of the inquirer. It was this life-sized laboratory of the Yi King that would give him the audacity and framework to formulate, years later, his renowned concept of Synchronicity.
Contrary to Freud's personal unconscious (composed of repressed memories), the Collective Unconscious is a deep stratum shared by all humanity. It contains the spiritual heritage of human evolution, a reservoir of primordial memories and images.
These are the fundamental structures of the Collective Unconscious. Innate models (the Shadow, the Animus/Anima, the Wise Old Man, the Self) that preexist consciousness and shape our dreams, myths, fairy tales, and instinctive behaviors across all cultures.
The ultimate goal of psychological development according to Jung. It is the process by which an individual becomes a whole being, an indivisible psychological 'individual', by integrating the conscious and unconscious parts of the mind.
The concept of synchronicity matured very slowly in Jung's mind. He first publicly mentioned it in 1930, but dared to publish a complete essay on the subject only in 1952, at the age of 77. He knew this concept would confront the mechanistic and purely causal vision of the science of his time.
Jung defined synchronicity as the temporal coincidence of two or more events that are not linked by physical causality, but by their MEANING. The inner event (a dream, an intuition, a strong emotion) resonates perfectly with an external, physical, and objective event.
The most famous example reported by Jung concerns a very Cartesian patient, blocked in her therapeutic development by her hyper-rationalism. During a session, she recounted to Jung a dream where she was given a jewel in the shape of a golden scarab.
At the very moment she described this dream, Jung heard a gentle tapping at the window behind him. He opened it and caught an insect in mid-flight: a golden beetle (Cetonia aurata), the local insect most resembling the Egyptian scarab. He handed the insect to his patient, saying: 'Here is your scarab.' This shock, defying all rational logic, broke the patient's resistance and reignited her healing.
For Jung, the scarab (a symbol of rebirth in ancient Egypt) did not appear *because* of the dream. The dream and the insect were two sides of the same phenomenon, orchestrated by an archetype constellated in the unconscious.
Synchronicity posits that psyche and matter are not two radically separate substances, but originate from a unique and underlying fundamental reality that Jung, echoing the alchemists, called the 'Unus Mundus' (the one world).
This vision was profoundly enriched by his long friendship and correspondence with Nobel Prize-winning physicist Wolfgang Pauli. Pauli, grappling with the paradoxes of quantum mechanics (where the observer modifies the observed matter), found in Jung's psychology the missing link. Together, they developed the idea that psychological archetypes and the laws of quantum physics govern the same reality: synchronistic events are momentary irruptions of this underlying, timeless, and spaceless order into our conscious world.
The major essay published in 1952 (often edited with a text by W. Pauli) where Jung theoretically expounds his concept and illustrates it with clinical examples and statistical experiments (notably astrological).
Written shortly before his death, it is the only book by Jung specifically aimed at the general public, intended to explain the basics of analytical psychology and the importance of dreams.
Published posthumously in 2009. It is Jung's most intimate work, a hallucinatory diary richly illustrated by himself, recounting his plunge into the unconscious.