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Clarify this, I see the elitism pronounced in TJ modalities of thought more than NF. I certainly know that self confidence is a way however missing the most important aspect, self belief, through a proper alignment in self belief with personal identity and spirit do we become rather and develop healthy thinking and feeling patterns.
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I see an elitist aspect in INFPs, but mainly enneagram 4s (of which I am one). It's a tendency to identify with your tastes (ie. music, art, etc), and consider yourself superior to others because of it. Or to feel you're so unique that no one can understand you (although to a point, I maintain it is true for many INFP e4 types

). True, it's quite different from TJs, and a lot more subtle. There's also the excessive humility side of the INFP that obscures this. Really confidence is not a yo-yoing between self-deprecation and elitism, but that's what an unhealthy INFP can look like. I think your personal identity broadens as you mature (and become healthier), so you don't have this restrictive image of yourself to live up to, and so your sense of self-value is less threatened & you can drop the shield of elitism.
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Feisty, arrogant, conceited, pretentious, insincere? Pick one, explore the dark side.

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Yes, in some ways, no, I don't think so, never!

. I could be ornery, moody, stubborn, and argumentative (no wonder I tested INTP

). I still can be, but not so much. Of course, the teen years are always the worst.
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Why would that bother you? Emotions and feelings are epicenter to being enlightened. For without them, thoughts nor feelings would manifest. Thoughts are created from feelings. Logical thoughts are emotional triggers, however much is denied, in essence. The heart knows more than the mind, how much stronger peoples resolve might be with a cooperative and cocreative heart and mind rather than an isolated mind to the heart that thinks living in a box is better than living in a field.
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Oh, I don't disagree. But I found emotions in other people overwhelming when younger, and my own embarrassing (as they reveal something of how you feel), and so I did dampen them down (maybe my e5 wing

). It was not anything I put thought into, but a knee jerk reaction. I'm finding this a lot more typical for INFPs than others might imagine. I would really avoid being affected emotionally by anything. As an adult, I find my feelings so much more refined when I allow emotion to have their fair part. It's the exact opposite picture of how some paint emotions, something that clouds thinking; they very much aid in figuring out feelings.