Looked at from the standpoint of modern consciousness, the position of medieval man seems as deplorable as it is need of improvement. But the much needed broadening of the mind by science has only replaced medieval one-sidedness—namely, that age-old unconsciousness which once predominated and has gradually become defunctive – by a new one-sidedness, the overvaluation of ‘scientifically’ attested views. These each and all relate to knowledge of the external object and in a chronically one-sided way, so that nowadays the backwardness of psychic development in general and of self-knowledge in particular has become one of the most pressing contemporary problems. As a result of the prevailing one-sidedness, and in spite of the terrifying optical demonstration of an unconscious that has become alienated from the conscious, there are still vast numbers of people who are the blind and helpless victims of these conflicts, and who apply their scientific scrupulosity only to external objects, never to their own psychic condition. Yet the psychic facts are as much in need of objective scrutiny and acknowledgement. There are objective psychic factors which are every bit as important as radios and automobiles. Ultimately everything (particularly in the case of the atom-bomb) depends on the uses to which these factors are put, and that is always conditioned by one’s state of mind.
– Carl Jung [CW 8 par 462]