Here is my response to a reader's letter, which is posted at bottom:
Your first question — "what exactly is Intuition of time" — is hardest to answer. The simple answer is that it is the internal experience of physically intangible phenomena. Ask 10 different socionists, and you'll get 10 different answers. But there is nothing inherently "mystical" about introverted intuition.
According to socionics, every function is responsible for both input and output — perception and behavior (passive and active "uses" of the function). Every type has all the functions and thus, at least to some degree, all the perceptive and behavioral potentialities of all the other types, however, the functions have different roles and importance for different types.
Next, what exactly is a mystical experience? Once you have defined it, can you assign that type of perception/behavior to a specific function? I suspect you cannot. Most people occasionally experience unusual states where their consciousness expands into unusual territory. This ability seems to me to be mostly unrelated to type. But is this what you mean by mystical experience? If you mean some type of totally otherworldly experience, then that is something that is indeed rare. I certainly don't have it, and most other people don't, either. This also suggests it's unrelated to socionics, because something socionically related should be more or less universal, while having different importance for different people.
If by mystical experiences you mean your own "beautiful impressions and poetical dreams," these are probably more or less universal. Almost everyone has these. Not the fact itself that you have impressions and dreams, but perhaps some of the content of your dreams and impressions is related to your specific socionic type, just as it is related to your basic personality and temperament.
I'm interested in transpersonal psychology. So I wanted to know, what exactly is Intuition of Time? Socionists believe, that this function is responsible for mystical experiences. So, can I ask an answer in simple English, why there is that function? How it makes mystical expreiences real. Why do socionists believe that it comes from this world and how sure we can be in that? Is this understanding final? Or is there place for other worlds?
I have a weak intuition, but I'm thinking that weak intuition too can have such experiences. I have had beautiful impressions and poetical dreams. But, are, in orthodox socionists understandings, the mysticism available only to strong intuiters?