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The concept does not question, or compete with, the notion of causality. Instead, it maintains that just as events may be grouped by cause, they may also be grouped by their meaning. Since meaning is a complex mental construction, subject to conscious and unconscious influence, not every correlation in the grouping of events by meaning needs to have an explanation in terms of cause and effect.
Even at Jung's presentation of his work on synchronicity in 1951 at an Eranos lecture his ideas on synchronicity were still evolving. Following discussions with both Albert Einstein and Wolfgang Pauli Jung believed that there were parallels between synchronicity and aspects of relativity theory and quantum mechanics. Jung was transfixed by the idea that life was not a series of random events but rather an expression of a deeper order, which he and Pauli referred to as Unus mundus. This deeper order led to the insights that a person was both embedded in an orderly framework and was the focus of that orderly framework and that the realisation of this was more than just an intellectual exercise but also having elements of a spiritual awakening.
From the religious perspective synchronicity shares similar characteristics of an "intervention of grace". Jung also believed that synchronicity served a similar role in a person's life to dreams with the purpose of shifting a person's egocentric conscious thinking to greater wholeness.
A close associate of Jung, Marie-Louise von Franz, stated towards the end of her life that the concept of synchronicity must now be worked on by a new generation of researchers.  For example in the years since the publication of Jung’s work on synchronicity, some writers largely sympathetic to Jung's approach have taken issue with certain aspects of his theory, including the question of how frequently synchronicity occurs. For example, in The Waking Dream: Unlocking the Symbolic Language of Our Lives, Ray Grasse suggests that instead of being a "rare" phenomenon, as Jung suggested, synchronicity is more likely all-pervasive, and that the occasional dramatic coincidence is only the tip of a larger iceberg of meaning that underlies our lives. Grasse places the discussion of synchronicity in the context of what he calls the "symbolist" world view, a traditional way of perceiving the universe that regards all phenomena as interwoven by linked analogies or "correspondences." Though omnipresent, these correspondences tend to become obvious to us only in the case of the most startling coincidences. The study of astrology, he argues, offers a practical method of not only becoming more conscious of these subtle connections but of testing and even predicting their occurrence throughout our lives. 
Synchronistic events reveal an underlying pattern, a conceptual framework that encompasses, but is larger than, any of the systems that display the synchronicity. The suggestion of a larger framework is essential to satisfy the definition of synchronicity as originally developed by Carl Gustav Jung. 
Jung coined the word to describe what he called "temporally coincident occurrences of acausal events." Jung variously described synchronicity as an "acausal connecting principle", "meaningful coincidence" and "acausal parallelism". Jung introduced the concept as early as the 1920s but only gave a full statement of it in 1951 in an Eranos lecture  and in 1952, published a paper, Synchronicity — An Acausal Connecting Principle, in a volume with a related study by the physicist (and Nobel laureate) Wolfgang Pauli. 
It was a principle that Jung felt gave conclusive evidence for his concepts of archetypes and the collective unconscious,  in that it was descriptive of a governing dynamic that underlies the whole of human experience and history—social, emotional, psychological, and spiritual. Concurrent events that first appear to be coincidental but later turn out to be causally related are termed incoincident.
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