This post was in response to someone asking about potential issues in relationships between ENTPs and INFPs:
The biggest issue that I see between NFs and NTs as Friends is that NTs have a way of turning interesting discussions into uncomfortable debates by focusing on offering contrasting ideas and often using a tone of voice that either sounds arrogant or dismissive of what someone else is saying (even if that's not their intention) - this causes NFs to need to switch their focus to mending the apparent personal rift because they percieve you as not respecting or liking them and it often ends up in a hurtful confused fight instead of an insightful discussion. INFPs are mainly interested in connecting through SHARED interests and feelings - through identifying with someone, so they like to focus on the areas where you agree, and they like to make others feel accepted, understood, and not-alone by affirming them even when they disagree - unless it is a topic that really 'strikes a nerve' with them. INFPs like to explore topics by each person putting forth personal speculations and observations, individually ruminating on these, and then offering further personal speculations and observations. While some INFPs can enjoy debate (that is: someone says something, what they say gets criticized/picked-apart/questioned, a defense is made and the opposition is picked-apart/questioned, etc.), it's not usually their natural conversational approach. Thus the NT's inclination to take an oppositional approach to a conversation is at odds with with INFP's mutual sharing and trying to 'connect' approach - even if both are interested in exploring an idea further. An INFP in a discussion with an ENTP might easily end up in a chasing-you-around-the-table kind of scenario trying desperately to join your side while you keep trying to switch chairs so you're facing each-other instead of sitting side-by-side.
One tactic that Really helps is if you can FIRST offer some kind of agreement or recognition of the other person's viewpoint - such as "I can see where you're coming from" and then continue with your contrasting point "but I ____" making sure it's clear that you're sharing a personal opinion rather than simply brushing off or attacking someone else's hard work of contemplation that brought them to this particular idea or viewpoint.
Secondly, when an INFP 'vents' to you about some problem, although your first inclination will probably be to offer logical advice, what the INFP is really interested in receiving from you is reaffirmation of your positive relationship with them so they don't feel alone against their troubles. All you really need to do is let them talk through their problem to you while showing acceptance through listening. To show further emotional support you could perhaps offer a hug or say something like "I'm so sorry to hear you're having this issue" - to let them know that how-they-feel/their-well-being matters to you. Another thing that can be really encouraging is if someone tells us they can understand why this situation has made us feel this way - note this doesn't have to be saying you actually think it's 'right' to feel how we do (sometimes we actually don't feel like we should feel this way, but that doesn't change the fact that we do) , it's just letting us know that you are at least making an attempt to understand us. Likely some of this sympathy stuff may feel sickening or make you cringe, and just being honest that you're not comfortable with it even though you understand it's one of the INFP's specialties can help with these awkward situations where an INFP is emoting at you. INFPs can also keep in mind that you'd enjoy hearing a little less of the sympathetic 'awws' when you try to discuss a problem though they may find it difficult to offer the kind of constructive advice or criticism you may be looking for (since it's usually not what they're looking for when they talk about about their problems). Often the classic INFP sympathetic response can trigger an NT to become more irritable and the INFP experiences this as the NT not wanting them to care about them and basically throwing away the meaning of their relationship. So.... if you can find a way to communicate that you appreciate them but that sympathy isn't what you need right now it might help them to feel less hurt.
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In a dating relationship one of the major issues I can see popping up down the road between an INFP and any NT is that NTs and NFs tend to have this great 'N connection' where they really enjoy all the interesting intellectual discussions - but although this does make an INFP feel close to you, they NEED to experience Emotional connection as well as Mental connection, but NTs don't seem to find the emotional connection so vital for an intimate relationship. This can result in the NT feeling satisfied while the INFP's needs aren't actually being met. Some important points to think about:
1) INFPs feel connected when others share in their feelings, that means being happy with them when they're happy, being sad with them when they're disappointed, being excited with them when they're excited - you don't have to be AS into the feeling as they are, but for a sense of Oneness to occur we need to see that how I feel affects YOU and matters to YOU. So be aware of the power of connecting WITH an INFP through being on their side with their feelings - being happy with them, or being offended on their behalf etc.
2) Now, ENTPs can be fairly expressive/enthusiastic, but NTs in general tend to go for a more understated approach to feelings - and I can tell you that when I'm excited about something being told to 'calm down' when I'm happy is a huge blow (it basically says nothing that matters to me matters to you and you don't want me to be happy), and being told to 'calm down' when I'm angry is just going to stoke the raging fire and not accomplish the desired result at all. Sometimes it's kind of like I will keep upping the amps as though you obviously just haven't heard the message yet UNTIL someone validates my feeling by saying something like 'yeah that's awesome' or 'I'm really excited for you" or "yeah that totally sucks" or "I'm so sorry you have to deal with that" - the confirmation will allow the feeling to pass more quickly, while any attempts to go against how we feel will usually not have a good result because it's basically antagonizing us.
3) Also INFPs will feel like you don't trust them and like you are holding them at a distance if you are unwilling to communicate your feelings to them. I know for some NTs they don't feel like they really have that many feelings to speak of, or may be loathe to express them outwardly or talk about them because dealing with them is just a really private matter. I'm not sure what solution there is for this, but it's something that can possibly show up down the line, again with the ENTP feeling like they know eachother well and have a great mental connection, and the INFP feeling like they are being held at arm's length. And an observation I've had is that often when an NT is experiencing a feeling they don't know how to express or don't want to think about right now they can end up funneling it into an expression of irritation (because they're irritated about the feeling after all) - that seems to be the default emote-mode. While they may be totally unaware that they are actually sending out these irritated emotional cues, the INFP is going to pick up on them loud and clear and if they're not good at analyzing you and understanding what it's really about they are likely to wonder if you are mad at them though they don't know why. Exuding a negative vibe like that, and then denying there's anything going on that you need to deal with becomes very toxic to the INFP over time as they are living in constant unexplained stress. Although we may not always be right in our analysis of others, it really helps if you can take a few minutes to clarify when we indicate we're picking up some vibe, even if it's just a simple 'I don't know, but I'm not mad at you.'
4) Ts sometimes have a way of taking for granted the good stuff and failing to remember to say things like 'I love you' or make compliments, often only commenting when they have a criticism. This can lead to an INFP getting only negative input and feeling like they are simply imagining (or it's wishful thinking) that you love them because you have left it as simply 'understood'. INFPs tend to need a lot of reiteration of your love, liking, and respect for them, so be sure not to hold back on making positive comments. Or depending on their 'love language' comments themselves may not be as important, but showing frequent reaffirmation and reiteration of your love through other means such as affection or putting aside quality time, doing favors or little gifts will help keep an INFP feeling appreciated and secure in the relationship. Really, the common T argument 'of course I love you, I'm still here aren't I' tends to feel like an excuse to take advantage of someone like you don't need to put anything into the relationship, and it further adds to a fear that at any moment you might disappear because if you aren't giving other clues about how you feel We Don't Know whether you're on the brink of changing your mind or not. Communication!!! ;)