Meaningful coincidences reveal patterns that causality cannot explain.
Modern rationalism assumes that if two events occur simultaneously or in proximity, one must have caused the other, or both must be the result of the same prior cause. This causal framework explains much, but leaves unaccounted a class of experiences that feel profoundly significant without fitting the causal chain. A person dreams of a symbol they have never consciously known, then encounters it by apparent chance the next day. A thought about a friend arrives just as they call. Synchronicity, Jung’s term for this phenomenon, names the possibility that these alignments are not illusions or statistical noise, but expressions of a deeper principle.
Jung introduced synchronicity as an “acausal connecting principle,” proposing that internal psychological states and external events can be linked by meaning rather than by cause and effect. Unlike conventional causality, where event A produces event B through some mechanical process, synchronistic events are connected through simultaneity and significance, as if the psyche and the external world are responding to the same underlying pattern. Jung argued this principle was necessary to explain certain psychological phenomena that defied conventional causal explanation, particularly the remarkable accuracy of divination practices like the I Ching and the archetypal symbols that appeared across cultures in dreams and myth.
The concept emerged from Jung’s clinical work and his collaboration with physicist Wolfgang Pauli, whose work on quantum theory suggested that nature itself might operate on principles beyond classical causality. In Jung’s system, synchronicity points to a more fundamental reality in which mind and matter are expressions of the same underlying order, rather than separate domains bound only by causal influence.
Source: Jung, C.G. (1952). Synchronicity: An Acausal Connecting Principle. In The Structure and Dynamics of the Psyche (Collected Works, Vol. 8).