“Just as the largest part of the past is so far removed that it is not reached by history, so too the greater part of the unconscious determinants is unreachable.
History, however, knows nothing of two kinds of thing, that which is hidden in the past and that which is hidden in the future. Both perhaps might be attained with a certain amount of probability; the first as a postulate, the second as an historical prognosis.
In so far as tomorrow is already contained in today, and all the threads of the future are in place, so a more profound knowledge of the past might render possible a more or less far reaching and certain knowledge of the future (…)
Just as traces of memory long since fallen beneath the threshold of consciousness are accessible in the unconscious, so too there are certain very fine subliminal combinations of the future, which are of the greatest significance for future happenings in so far as the future is conditioned by our own psychology… it appears from time to time, in certain cases, significant fragments of this process come to light, at least in dreams. From this comes the prophetic significance of the dream long claimed by superstition.
The aversion of the scientific man of today to this type of thinking, hardly to be called phantastic, is merely an overcompensation to the very ancient and all too great inclination of mankind to believe in prophesies and superstitions.”
–Carl Gustav Jung, Psychology of the Unconscious, 1916.