What is mysticism? I can't resist adding some more comments here, this really is an inexhaustible topic. People have different sensibilities, preferences, perspectives, biases and perceptions. I can't substantiate this claim with any evidence, but I suspect a minority of people may not have felt as impactful something analogous to what mysticism may be, which can be loosely associated with spiritualism and the like.
But I have a hard time believing that even this minority has never felt, at least one time, a feeling that this moment here is extraordinary. One aspect of mysticism would be those situations which can be put in words (inadequately) and made manifest, such as being in nature and suddenly feeling how sublime and impactful the world around may be. In this sense there is the external anchor, meaning, we relate the mystical experience with something in manifest reality, the world "out there", to speak loosely.
Another instance would be that of an internal nature. I remember once walking in my city, listening to music, I don't remember what kind. I suppose I was feeling good, or at least I was untroubled. As I was taking my usual route, quite suddenly, my body disappeared from the planet. What follows can only be an aberration as put into words. But it was if my body ceased to exist. I was only consciousness. I suppose a very rough analogy would be to think of the phenomenon of ball lighting in the mind's eye, all there was was thoughts connected to other thoughts, waxing in and out seamlessly.
I had no legs, no arms. The world was gone, in the sense that it receded so far into the background, it was inconsequential and totally negligible. Kinda like when one goes to the movie theater and is so engrossed in the movie, that you cease to notice the seats and people around you, but magnified to maximum capacity.
This must have lasted, I want to say, somewhere between 7 to 10 minutes. As soon as the world left, it came back. And I was immediately cognizant of the fact that something absolutely extraordinary had happened, feeling like a cloud of blissful thought. This kind of mystical experience I'd call "internal", in the sense that the world per se was not the object of amazement. I've never known what it meant, nor how to get that feeling back, if it's possible at all.
I reached no theological conclusions, nor did it vindicate or eliminate any previous views I my have had about the world. Only the trivial statement that the power of the mind is beyond words, by far.
I can only say that I do feel sorry for that potentially few percentage of people who deny or pay no attention to such experiences. But I understand that this type of personal evidence should not be taken to make theoretical postulates about the world.
Sorry for the long post, but I feel I should've shared that, if only for my benefit.