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I'm not assuming anything. I ask people now and then and I find that they not only haven't done the work required, it never occurred to them that they should. That said, I'm interested that you have. If you feel like it, let me know your experience.
And no, I've never assumed the actuality of spiritual transcendence and then tried to justify my assumption. Quite the opposite in fact. I was an atheist for years until someone urged me to do a little meditation and lo and behold I discovered for myself what people were talking about and had written about all those centuries. I found it odd that I had always thought of myself as a pretty rational guy, rigorous in my thinking, but it had never occurred to me that to attain spiritual change, one must actually do some work in that direction. A simple concept really, but so few atheists get it.
I look forward to hearing your experience and what spiritual discipline you followed.