As far as dispassionate sympathy...kind of. At first I thought no, because my actual internal experience feels anything but dispassionate. It feels intensely passionate. However, my expression might appear dispassionate for two reasons.
Good point! I'm the same: intensely passionate inside, but it doesn't really show that much on the outside (well, I guess... I mean, I can't see myself from the outside, so...

) So I guess it could look like "dispassionate sympathy" to an outside observer.
Of all the samples I'd seen, the INFJs were the most guarded, for want of a better word. Would I be right to say that it is a self-protection / evaluating if others are worth giving to, and constantly reassessing that, before giving?
I can only echo what the others have said: in my case, it's not about "evaluating if others are worth giving to", it's almost entirely about self-protection. I mean, ideally, I'd give love and compassion even to psychopaths, because as far as I'm concerned everyone "is worth giving to". But I don't go around giving to just anyone because *I* couldn't take it. It's not them, it's me.
I'd like to understand what creates/motivates holding on to those walls, simply. I can understand an amount of guardedness for protection as being wise, but is this the only reason?
Pretty much, yes. To continue with the black box analogy, here is more or less how I see myself:
* At the center, there is this undestructible black box.
* Around it, there's this huge layer of puffy matter. It's made up of my own home-grown stuff, but also of stuff imported from the outside: expectations, appreciation, and so on. (That's what Cascade explains so well in her post, for example.) Press upon it from the outside, and you can easily mold it, punch holes in it, cut through it, whatever.
* On the outside, there is the crust, the walls put up to protect the puffy insides.
Without the walls, anyone, and I mean *anyone* could pass by me and punch me, cut me, hurt me, deeper and deeper and deeper. The only thing that would eventually stop them would be when they reached my black box core. But that's a LOOOOONG way down!! The damage done on the way would be of monumental proportions!! I'd be a total wreck.
So there's no other solution but to build and maintain those walls, and let in only the people I can trust to not poke and punch too much around.
I'm irrationally afraid that if I ever share anything that is in my black box, someone would reject it and that would be very painful.
I don't find it to be an irrational fear, personally. This black box contains the "essence" of my personality so to speak, and for someone to reject it would mean rejecting ME, which would be awfully painful. So it's far easier for me to just not share that blackbox: this way nobody can TRULY reject me.
It must be confusing for me to keep referring to my black box, but it is my most vulnerable spot and so I can't just share what's in it with anyone.
Same for me.
I had a friend that I was always close to since kindergarten and right before we graduated she told me, "Travis, I have known you since I was 6 years old, and now I am 18 and I don't feel like I ever really knew you...".
Nobody ever told me anything like that, but I think it's because they never realised just how much they didn't know me
