Jung gave a full statement of this concept in 1951 when he
published the paper Synchronicity - An Acausal Connecting Principle,[1]
jointly with a related study by the physicist Wolfgang Pauli.
In Jung’s and Pauli’s
description causality acts from the past, whereas synchronicities act from the
future. Synchronicities are meaningful since they lead towards a finality,
providing a direction to events, linking them in an apparently acausal ways.
The Vital Needs Theory - page 51
[1] Jung C.G. (1951), Synchronicity -
An Acausal Connecting Principle, Princeton University Press,
www.amazon.com/Synchronicity-Connecting-Principle-Collected-Bollingen/dp/0691150508