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Everyday reasonableness, sound human judgement, and science as a compendium of common sense, certainly help us over a good part of the road; yet they do not go beyond that frontier of human life which surrounds the commonplace and matter of-fact, the merely average and normal. They afford, after all, no answer to the question of spiritual suffering and its innermost meaning. A psycho-neurosis must be understood as the suffering of a human being who has not discovered what life means for him. But all creativeness in the realm of the spirit as well as every psychic advance of man arises from a state of mental suffering, and it is spiritual stagnation, psychic sterility, which causes this state.
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C.G. Jung (Modern Man in Search of a Soul)