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If there is an Achilles’ Heel, for an INTJ, it's Extraverted Feeling (Fe), the Trickster function. Beebe (2017) described the Trickster function as the “Shadow of the Tertiary function.” The Trickster function is the blind spot of the person, making someone unaware of a particular function. In the case of an INTJ, we are unaware of how others feel. While we walk around with a stoic, but in reality, neutral expression, this often makes others (especially high Fe users) uncomfortable, as a pupil of Carl Jung put it.

"Even as the main function of a person’s stack, introverted feeling is very difficult to understand. A very good example of it is the Austrian poet Rainer Maria Rilke. He once wrote “Ich liebe dich, was geht's dich an,” which translates to, “I love you, but it’s none of your business.” That is love for love’s sake! Feeling is very strong, but it does not flow towards the object. It is rather like being in a state of love with oneself. Naturally, this kind of feeling is very much misunderstood, and such people are considered very cold. But they are not at all; the feeling is within them” (Marie-louise von Franz pg. 49).