While mystical experiences are very personal, and are highly personalized, there are some broad categories experiences in which they are shared across people who have had them. They are oddly repeatable* even if they are not falsifiable. There are signatures that are in common, and you can recognize them. "Getting" Rumi for me was like this: After my own experiences, I stumbled back across Rumi and it suddenly made sense. I can see what informed his poetry, even across linguistic, religious, and historical lines.
This was the same with Tao Te Ching. What was impenetrably cryptic was suddenly intuitive. Or Zen Koans for that matter.
*They are oddly repeatable even across religious lines, even in cultures that may not have formal religions. It's not religion that makes the mystic.
That sums up the matter well enough. You simply can't directly address the mystic from the material.
http://www.newyorker.com/books/page-turner/the-erasure-of-is...
The former two in particular are often thought of as nothing more than means for improving one's health or destressing, with little if any appreciation of their religious roots.
However, there's huge kernel of truth here—Buddhist sects in particular (I can't speak for other uses for meditation; it's a huge area of knowledge) are entire frameworks (or philosophies, if you'd prefer) for how to think about life, and picking and choosing subsets of it will only bring subsets of the rewards.
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In Case of Emergency, Shatter Ego
i am not a process, but the pattern.
i am not a system, but the shape.
i am not a rapid, but the river.
i am not the ocean, but a wake.
i am not the etching, but an image.
i am not the constant, but a rate.
i am not the message, but a relay.
i am not a signal, but the wait.
i am not a digit, but an index.
i am not a value, but a space.
i am not a body, but a person.
i am not a vertex, but a face.
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If you liked that, here's a whole book full of it:
https://www.amazon.com/Mechanics-Emotion-Structure-Possibili...
These two lines were my favorite:
i am not a digit, but an index.
i am not a value, but a space.
And felt like these lines went against the message of the rest: i am not the constant, but a rate.
i am not the message, but a relay
i am not a vertex, but a face.