Okay, after pondering java's posts here for awhile, I have come back to comment

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Furthermore, we must be critical of a routine - if it stops working effectively at any point, it must be either revised or thrown out, and we must be careful not to go down with the ship.
Yes, I have decided to more or less throw "efficiency" out the window for now, and think in terms of effectiveness. In my case, at times I have worried so much about being "efficient" in terms of organization, time use and these things, that I have gotten very stuck... or developed routines that mean next to nothing. Efficiency without meaning becomes relatively ineffective as an approach to living a fulfilling life. And, if nothing else, I would like my life to be at least meaningful. I can tell when I am practicing
effectively or not, and ultimately, no matter how organized or unorganized I may be, effective practicing is always the most efficient, I have found.
Also, "The endless exploration of sound" does not mean exclusively improvising. Take any chord progression, run, contrapuntal section [especially counterpoint] from some piece, and try accenting different notes/chords, emphasizing different voices, etc. This is exploring music written by someone else - that hopefully says what we want to say much better than we can say it. But then you take these words and make them personal again. Depending on what you do, you can make a single measure sound like entirely different things.
It's strange, only just recently have I been exploring sound more, I think. It's not necessarily that I am trying different devices on a particular passage, though that can be interesting. It's more like flipping some kind of switch now within myself, where in one case I am going through a routine, and in the other case I am listening and hearing what I am playing, and somehow finding meaning and fulfillment within the endeavor in that very moment. I am not positive how this came about, unfortunately, though my last meeting with my mentor may have had something to do with it

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I do know that I am finding this kind of practicing to be way more effective. I am not sure (yet !) how to help others to do it though. Though my meetings with my mentor have been of a great help, I know that it's ultimately my decision. Objectively, I suppose a mentor/teacher will aim to lead an individual to a place, and then it's up to an individual to explore it or so. I guess what my question is, how do you get people to see it ? It seems that individuals can be led there, but what if they are not capable of seeing it once they are there ? That's the part that I don't understand. My mentor probably more or less led me in this direction, but what if I didn't see it ? I suspect there is much more to be seen of course, but still !
I think it's becoming very well-known and perhaps cliche to talk about natives of particular lands being able to see the people who came off of the big ships that brought the explorers from overseas, but not being capable of seeing the ships, as it just wasn't anything they had ever conceived of before. They knew of people already, and therefore saw the people, but they didn't know of the sorts of ships that brought them and therefore didn't see them. Perhaps helping other individuals to explore music, explore sound, to listen to themselves ... is something like that ?
Well, back to the bench for me.