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1 " Many people discover relatively soon in life that the realm of their inferior function is where they are emotional, touchy and unadapted, and they therefore acquire the habit of covering up this part of their personality with a surrogate pseudo-reaction. For instance, a thinking type often cannot express his feelings normally and in the appropriate manner at the right time. It can happen that when he hears that the husband of a friend has died he cries, but when he meets the widow not a word of pity will come out. They not only look very cold, but they really do not feel anything! They had all the feeling before, when at home, but now in the appropriate situation they cannot pull it out. Thinking types are very often looked on by other people as having no feeling; this is absolutely not true. It is not that they have no feeling, but that they cannot express it at the appropriate moment. They have the feeling somehow and somewhere, but not just when they ought to produce it. "
― Marie-Louise von Franz , Lectures on Jung's Typology
2 " Practically, it is most helpful when one wants to find out the type to ask, what is the greatest cross for the person? Where is his greatest suffering? Where does he feel that he always knocks his head against the obstacle and suffers hell? That generally points to the inferior function. Many people, moreover, develop two superior functions so well that it is very difficult to say whether the person is a thinking intuitive type or an intuitive type with good thinking, for the two seem equally good. Sometimes sensation and feeling are so well developed in an individual that you would have difficulty in ascertaining which is the first. But does the intuitive thinking person suffer more from knocking his head on sensation facts or from feeling problems? Here you can decide which is the first, and which the well-developed second, function. "
3 " The little open door of each individual’s inferior function is what contributes to the sum of collective evil in the world. "
4 " The fourth function is always life’s great problem: "