Synchronicity: what Jung meant by meaningful coincidence
You think of someone you have not spoken to in years, and that afternoon they call. Jung had a word for moments like that: synchronicity, a meaningful coincidence with no obvious cause. He published the idea alongside a Nobel Prize-winning physicist. Here is what synchronicity means, what the statistics of coincidence say, and how to use these moments without fooling yourself.
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Synchronicity meaning
Jung defined synchronicity as an acausal connecting principle: an inner state and an outer event that line up in a way that feels meaningful, with no cause linking them. He set out the full idea in 1952, in a volume published with the physicist Wolfgang Pauli, who contributed an essay on the astronomer Kepler. Jung placed the meaning of such events in what he called the psychoid nature of the archetypes: a level at which psyche and matter might not be separate.
Why coincidences feel like messages
Coincidences are far more common than they feel. The statisticians Persi Diaconis and Frederick Mosteller called this the law of truly large numbers: with a large enough sample, any outrageous thing is likely to happen. As an illustration: if you think of hundreds of people over a year, one of them calling on the same day becomes likely sooner or later.
That does not make noticing coincidences foolish. Psychologists Mark Johansen and Magda Osman argue that experiencing coincidences is a necessary result of rational causal learning. The mind spots co-occurrences, searches for a cause, then judges whether it was chance. Trouble starts when the third step is skipped.
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Read the first chapter free →Two ways to get it wrong
- Dismissing everything. You lose information about yourself. What you noticed, and why it mattered, says something about what is already on your mind.
- Believing everything. Decisions start to run on signs. Money, relationships and careers get steered by events that would have happened anyway.
Both extremes ask the wrong question: is the universe sending me a message?
A better question
Ask instead: what does this moment show me about what I already want? Treat a synchronicity as data about your attention, not proof about the world. Then decide on reasons you could explain to a friend. You keep the meaning and lose the risk.
How carefully do you read coincidences?
Rate each statement. 1 means rarely; 5 means almost always.
1 = rarely · 5 = almost always
A reflection prompt, not a psychological test or advice. Your answers stay in your browser; if you continue to the free chapter, only your total is added to the link.
What the evidence says
- Coincidences are common, and large numbers explain many of them (well supported: Diaconis and Mosteller, 1989). Noticing them may be part of normal causal learning (argued by Johansen and Osman, 2015).
- Synchronicity as a principle of nature has no experimental support. It is a philosophical proposal, which APSP treats as a model.
- In Jungian therapy, meaningful coincidences are used as material for reflection, not as predictions.
Synchronicity and APSP
The “psychoid” in Applied Psychoid Systems Philosophy is Jung’s word from this same body of work. APSP uses it for the point where how you think becomes how your life runs, and labels it a model, not a proven structure. Read what quantum physics does and does not say about mind and matter, or start with your own telos: the one sentence that tells you which coincidences matter.
Questions about synchronicity
Is synchronicity real?
Meaningful coincidences are real experiences, and very common. Whether they reflect a hidden principle of nature, as Jung proposed, has not been shown by experiment.
What is the difference between synchronicity and coincidence?
Every synchronicity is a coincidence. Jung used the word for the ones that feel meaningful because they match an inner state.
What did Pauli have to do with it?
The physicist Wolfgang Pauli worked with Jung on the relation between mind and matter. Their 1952 volume paired Jung’s synchronicity essay with Pauli’s essay on Kepler.
Sources
- Jung, C. G. (1952). Synchronicity: An acausal connecting principle. In Jung & Pauli, The Interpretation of Nature and the Psyche. Entry by J. Beebe, Encyclopedia.com. Source
- Diaconis, P., & Mosteller, F. (1989). Methods for studying coincidences. Journal of the American Statistical Association, 84(408), 853–861. Source
- Johansen, M. K., & Osman, M. (2015). Coincidences: a fundamental consequence of rational cognition. New Ideas in Psychology, 39, 34–44. Source
Checked October 16, 2026. Evidence labels follow the APSP evidence tiers. Educational content; not therapy or professional advice.
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