After some time, people assume they "know" that person. They assume how they'll react to situations, events, and even to other people. There's only one problem with that, people are always changing. One can't peg another person to this idea they've developed of them because how one perceives another is entirely subjective. This especially applies to the INFJ that develops a world inside their mind that doesn't get seen by others unless allowed. Even the intentions and the true values hidden behind an INFJ's actions aren't black and white as others will perceive. The world itself is also open to the change of the INFJs life, realizing that new discoveries may shift the world around because INFJs understand that people change, all the time. What's even harder is the difficulty INFJs have with explaining the reasons behind what they do and why because their reasons come from the world that is created inside their minds that relates back to experiences they can't let go of and memories that have become lessons. So complex that words can't even touch the surface of this world. Yet an INFJ is simple yet complex. Because they live in this world everyday the complexity slowly becomes simple to them but to explain it to another is too complicated. Therefore even when an INFJ wants to have others understand them, they can't truly express themselves and be seen the way they are. And even if an INFJ is understood, it's hard for the INFJ to truly believe so because they feel so different from everyone else. There is always this sense of no one will truly understand them that an INFJ constantly goes through. It takes a truly open minded person who understands people change all the time to understand an INFJ. Most importantly after that, to develop a strong relationship though also requires the trust and open honesty of surprisingly the INFJ. To be open about their extremely complex reasonings and determination to help others understand them and in return the other to want the same. To find meaningful relationships like this can be very hard in general. Mostly requires time, and again, lots of energy of an INFJ. Relationships are so important to the INFJ, and the meaningful relationships they have are like glistening gems that they don't want to lose.