Often a patient's drawings contained patterns and symbols that revealed the patient's inner conflicts. In the process of making these conflicts conscious through creativity, the patients were better able to resolve these conflicts. In other words, resolution of the patient's inner conflict was an intuitive dialectical process rather than a reasoned process. It is not the truth that sets you free, it is the experience of the truth that sets you free. Jung's process relied on symbols.
Symbols are metaphorical in function.
Metaphors are irrational. One of the primary tenets of logic is that metaphor is not a valid form of argument. That the resolution of an inner conflict cannot necessarily be analyzed, that it is not rational, that it might not be representable in a computer program, that it cannot be prescribed like a vaccination, is a hard thing to accept for those of us who's mindset values control, eschews unpredictability and vulnerability, finds beauty in the structure of a computer program, and accepts that time is well spent trying to create artificial intelligence with strictly procedural programming methods. The force of dialectic reveals itself again. When functioning correctly, it affirmed the need to resolve inner conflicts and balance societal forces and did so through a vocabulary of ritual, symbol, and sacredness.