The collective unconscious surrounds us on all sides.... It is more like an atmosphere in which we live than something that is found in us.... Also, it does not by any means behave merely psychologically; in the cases of so-called synchronicity it proves to be a universal substrate present in the environment rather than a psychological premise. Wherever we come into contact with an archetype we enter into relationship with transconscious, metapsychic factors. This development in Jung's thought thus constituted a major shift in his understanding of the religious situation confronting the modern psyche. From early in his career, Jung saw both the psychological and the spiritual path of the modern self as requiring a sustained direct encounter with the archetypal unconscious. Here lay the possibility not only of deeper psychological self-awareness but also of spiritual transformation, permitting an engagement with those numinous realities that could profoundly heal the psyche and provide it with an orienting purpose and transcendent meaning. Throughout most of his writings this engagement was understood as taking place within what Jung essentially regarded as the sacred circle of the human psyche. Eventually, however, Jung's many years of studying synchronicities moved him to recognize this engagement as something that is enacted within the larger sacred circle of nature as a whole. In this perspective, not just the interior depths of the human psyche but also the interior depths of nature itself supports the unfolding of human spirituality and each person's struggle towards individuation.
— Richard Tarnas
Jung began his career convinced that the encounter with depth happened inside — the sacred circle of the psyche, the interior as the arena of transformation. What Tarnas is tracking here is the pressure that synchronicity put on that boundary until the boundary gave way. The unconscious stopped behaving as if it were housed in the individual and started behaving as if the individual were housed in it. That is not a small revision. It is the difference between a psychology and a cosmology.
Notice where the language runs: healing, orienting purpose, transcendent meaning, the unfolding of human spirituality. These are the words of a soul reaching for something outside the mess — relief, direction, the sense that the universe is organized on one's behalf. The discovery that nature's interior depths support individuation can be received as liberation from loneliness, or it can be received as a larger version of the same relief the psyche was already seeking. Synchronicity does not promise comfort; it promises disclosure. What gets disclosed is not always friendly. Nature's interior, if it is really that, is not a therapeutic environment — it contains the lion and the plague and the flood alongside the annunciation. Taking the cosmological claim seriously means keeping that whole range in view, not harvesting the numinous for its consoling register.
Richard Tarnas·Cosmos and Psyche: Intimations of a New World View·2006