Naturally every age thinks that all ages before it were prejudiced, and today we think this more than ever and are just as wrong as all the previous ages that thought so. How often have we not seen the truth condemned!
It is sad but unfortunately true that man learns nothing from history. This melancholy fact will present us with the greatest difficulties as soon as we set about collecting empirical material that would throw a little light on this dark subject, for we shall we quite certain to find it where all the authorities have assured us that nothing is to be found.
Reports of remarkable isolated cases, however well authenticated, are unprofitable and lead at most to their reporter being regarded as a credulous person. Even the careful recording and verification of a large number of such cases, as in the work of Gurny, Myers, and Podmore, have made next to no impression on the scientific world. The great majority of “professional” psychologists and psychiatrists seem to be completely ignorant of their researches.
The results of ESP and PK experiments have provided a statistical basis for evaluating the phenomenon of synchronicity and have at the same time pointed out the important part played by the psychic factor. This fact prompted me to ask whether it would not be possible to find a method which would on the one hand demonstrate the existence of synchronicity and, on the other hand, disclose psychic contents which would at least give us a clue to the nature of the psychic factor involved.
I asked myself, in other words, whether there were not a method which would yield measurable results and at the same time give us an insight into the psychic background of synchronicity. That there are certain essential psychic conditions for synchronistic phenomena we have already seen from the ESP experiments, although the latter are in the nature of the case restricted to the fact of coincidence and only stress its psychic background without illuminating it any further.
C G Jung, Synchronicity