In what way useful? I did go into reading Kybalion years ago, not sure how far I went. Don't think I ever finished.
Discussion
Useful as to not believing too much into one source only, useful in balancing ideas around ...
I don't blindly take ideas and easily discard what doesn't resonate. At this point I am also quite the experienced psychonaut so I have direct connection with a lot and those journeys I feel are more coloring my belief system than anything else. Stuff like that I might plug into oftenni like as a reminder as well as expanding my lens, to experiment and explore.