Fi in INFJs and ISFJs
Attuned to the inner worlds of themselves and others, highly conscious of their individuality and distinctiveness, and sincere and heartfelt in communication, these types are admired for their sympathetic nature, soulfulness, and powerful personal conviction that flies in the face of popular opinion. On the other hand, they can be fragile, depressive, absorbed in their own inner emotional anguish, and suffer from Avoidant Personality Disorder.
Their Fi is unconscious and unvalued, whereas their Fe is conscious and valued. They are quite aware of inner emotional worlds of people, even when external signs (Fe) are absent. They have a rather personal one-to-one matter of communication. Their Fi is stronger than their Fe: unlike Fe dominant types they have an acutely sensitive awareness of their individuality. They can get lost in others feelings and outer emotional atmosphere at times (Fe), but they can come back to reflecting on their own emotions and uniqueness for extensive periods of time (Fi).
Visually, I notice it is almost as if their whole body is sinking with melancholy (from Fi). It looks as if the weight of the world is on their shoulders. There is a sadness to them, as if they are troubled or secretly carrying a feeling of deep guilt— but when they approach you they hide this under a cheery and harmonizing Fe.
These types have Fi as a 4D (very strong) function, leading to a tendency to idiosyncrasy and knack for subjective evaluation. It can kind of feel like you don’t know how much of an individual IxFJs are until you peer behind the mask—and therein lies a beautiful (and quirky, even bizarre) treasure, for in fact their tastes and attitudes can be a far cry from the norm. IxFJs struggle with self-consciousness, as their valued Fe tells them to conform and fit in and just be one with the emotional atmosphere of others, but their Fi sense of individuality and “differentness” is in fact stronger.
The Te of IxFJs is PoLR, meaning it is very weak and unvalued. This utter lack of Te, strong Fi along with their auxiliary Fe (two feeling functions in a row after Ni or Si in strength) actually makes their demeanor and mannerisms noticeably more artsy than their IxFP counterparts, who are beholden to their inferior Te. The manner which Te presents itself is the least artistic of all functions (art is anything but going straight from A to B). Without sufficient Te IxFJs can get sucked into a very artistic and indirect approach towards life without counterbalancing from Te pragmatism. Their Fi can get out of whack as they sink deep into an emotional subjectivity that rivals that of IxFPs.
Their strong Fi can make them really relatable at a deeper emotional level, and thus others feel like they can confide in them. If you listen to them, they tend to be highly sensitive to injustices done to themselves and others, and emotional events leave behind in them a strong trace. Due to the unvalued nature of Fi, they may see it as a fault in themselves, as it causes them much pain, not realizing what a gift it is and how much others respect them for the subjective truth they bring to the world.
Ti in ISTJs and INTJs
These types are intellectually complex, labyrinthine and precise in their thinking, good at systems analysis, classification, and understanding subtly nuanced laws of nature or phenomena. They are admired for their high intellectual sophistication, as others rely on them for troubleshooting and providing a deep technical understanding and great clarity of reasoning of difficult material. They are also known for approaching situations in a cool-headed, unflappable manner (Te dominants, by contrast, tend to be much more outwardly volatile).
Basically, Ti manifests physically as a calm, placid facial expression, yet sharp and intellectually alert gaze in the eyes of IxTx types. It comes off as passive or receptive to the outer environment, but mentally rigorous and powerful, as evidenced in the eyes.
The minds of IxTJs are like deeply intricate yet pristine structures. There is an enviable clarity to their minds, like a finely oiled machine. On the other hand, these types may appear cold-blooded, hairsplitting, and skeptical. When working towards their dreams, they can be rather piecemeal. Their approach to others therefore seems plunkety-plunk and robotic. This is exacerbated by Fe PoLR, meaning Fe is their weakest and most unvalued function. Even though IxTPs are Ti-dominants, the Ti approach is counterbalanced by their inferior Fe. IxTJs struggle like IxTPs with paralysis by analysis more than other types.
Their Ti is unconscious and unvalued, whereas their Te is conscious and valued. Their thinking is noticeably more subtle and intricate in complexity than Te dominants due to their very strong Ti, however they prefer Te because it creates a sense of progress and pragmatism. They are rather suspicious that there is such a thing as a well-defined law and order, however sophisticated, that can capture reality.
Thus, they deliberately create workable solutions to prevent themselves from getting into the endless and useless task of Ti to find such law and order. To the bemusement of others, they may seem to draw what appear to be surprisingly black-and-white, forced conclusions, but this is subconsciously really for practical purposes (Te) rather than their actual conclusions on the nature of reality (Ti), even though they may present it as such. They don’t want their minds bogged down with superfluous thinking.
Others can see their Ti abilities and are surprised when these types switch over to Te, as if they are shortchanging their intellectual complexity for the sake of efficiency. It seems like they are sophisticated in some areas of thought, but then deliberately overly simplistic in other areas “to save time” or to have a sense of purpose.
The utter lack of Fe can turn into losing connection, engagement, and reliability with others, and getting lost into an ever-narrowing tunnel of thoughts, as Ti seeks never-ending analysis. Fe PoLR expresses itself in an utter lack of artistry in life approach. Ti is also used more privately, when relating to others Te comes to the forefront. This can seem like they have carefully thought over very difficult material (Ti), and are able to explain it in a clear-cut to others with Te (though Ni and Si can get in the way of this clarity).
Ni in INFPs and INTPs
Deeply introspective and contemplative, prudent and possessing good foresight, these types are admired for their wisdom and insightfulness on the weightier matters of life. On the other hand, they can be passive, missing the moment to seize an opportunity, and seem to fade into the background due to their lack of presence and energy.
Ni causes them to appear rather like retiring hermits, perpetually lost in thought, and others subconsciously assume these folks must somehow be quietly sagacious. Fragile and uncertain in the physical world due to low Se, Ni makes up for this by giving these types the appearance of exuding a quiet confidence. This is a philosophical confidence rather than a confidence in their physical environment—Ni grounds these types in certain views of life and the world that make them act in foresight and knowingness. They have notably greater prudence than Ne dominants, and also greater tolerance to revisiting a singular theme as if refining a stone.
Overtime, they develop a original worldview that synthesizes what they have learned–a bird’s eye view that keeps getting higher and higher. However, these types value Ne over Ni, which means they prefer to be multi-perspectival. By nature they can easily come up with a way of looking at things to ground their being in with Ni, but with Ne they seek different ways of looking at life and the world, and are hesitant to tie themselves down to a singular worldview.
With Ni, they try to see how things will develop over time, trying to foresee dangers, adapting to what they predict. However, with Ne, they want to see what the world has to offer, the infinite unexpected possibilities “out there” over the horizon to explore, and would rather be taken by surprise than stick to what will likely unfold. Predicting what is likely to be, limiting oneself to a few perspectives to stick to and refine is viewed as stifling and boring. They know all too well that clever and bold innovations that come out of nowhere (Ne) can overcome a seemingly inevitable fate (Ni). They rather pay attention to these, however unlikely they are to happen.
With Ni as a 4D (very strong function) and Ne next in line in terms of strength, these types are bombarded with all sorts of thoughts and ideas (they are both deep contemplators with Ni and expansive innovators with Ne) —but can have little willpower to execute anything they come up with through their intuitions concretely in the now.
This is because Se is very weak and unvalued. Since Ni is not counterbalanced with Se, INxPs can end up with really deep inexplicable visions, lacking a clear-cut way to explain them in lucid speech or execute them into concrete actions (Se helps makes things black-and-white but clear). INxJs are aided by inferior Se in this regards.
IxTPs can be very good at understanding Ni-style topics thoroughly because they have very strong 4D Ni (Ne can be somewhat superficial or lacking thoroughness in understanding such topics). Ni basically is convergent form of thinking. They may try to shortchange their Ni abilities by the attractive fresh flutter of divergent and seemingly irrelevant ideas that Ne brings. Ni-valuing types like the INxJs may be able to see the Ni abilities of IxTPs, and be frustrated and disappointed when IxTPs kind of toss Ni away to do more Ne.
Si in ISTPs and ISFPs
These types are meticulous about details, possess fine and subtle aesthetic taste, and capable of creating soothing, calming, and physically enjoyable atmospheres for others and themselves. On the other hand, they can fail to see the forest for the trees and their habits and conservative nature may make them unable to embrace change.
Both ISTPs and ISFPs exude a calming effect on those they care about or in their inner circle. If you observe them, privately they are quite capable of enjoying the pleasures of life and know how to provide just the right amount of it, and this can make them great hosts and caretakers.
Their work, artistic or not, shows a very fine attention to details. They are highly aware of their bodily needs and that of others, and compared to Se dominants have a greater knowing of when to stop before over-exhausting oneself.
Se dominants have an aesthetic too, but comparatively ISTPs and ISFPs are more fine and subtle in their tastes. They do not necessarily opt to protrude out into the environment like ESFPs and ESTPs. For ISTPs and ISFPs, with Si as a 4D (very strong) function, and Se as an auxiliary, there is a tug-of-war between the needs of these two sensory functions.
Unlike ISTJs and ISFJs who also have Si as a 4D function, ISTPs and ISFPs value Se. They know how to relax well, but they are more interested in pushing themselves to achieve goals with a harsh discipline. When ISxJs do work, they go about in a very relaxed way. ISxPs by contrast can get rather intense and tough. They are willing to confront people, act assertively, and tackle obstacles head on when need be. Si is submitted to Se demands, their fine attention to detail is used in their highly diligent Se approach to life.
ISxPs are Ne PoLR—Ne is very weak and unvalued. They cannot handle ambiguity and have difficulty seeing the larger picture. With a workhorse Se and the singular vision of Ni, they can suffer from tunnel vision. Si contributes to habit and narrow vision, so with a very weak Ne, Si runs amok and ISxPs focus way too much on little details and what they are familiar with, fearing change. ISTJs and ISFJs, with inferior Ne, are suggestive to novel opportunities by contrast. ISxPs change when there is a complete shift in worldview via Ni, but this change tends to be drastic.