I studied Zen long ago and greatly enjoyed it. I have since gone mostly too Theravada. But i'm still very interested in Zen for many reasons, mostly it's unique approach too apprehending the mind and take on meditation.
However i'm fairly confident, after years of fruitless study, that one must have a teacher. No matter how much I read about it, I can never come to any concrete methods or conclusions, it's all vague and changeable. Every tradition has it's starting points, how to meditate, how too cultivate daily mindfulness, etc. but then there's this stopping point where there are no new practices or levels too reach in already known practices without a teacher.
which leads too the next problem: how would one know if they are wasting their life learning from someone who is not actually a Zen master capable of teaching them the way?
I want too learn Zen but I don't want too waste my life with one teacher who may not be good but that I might not know they are not good, or going from one too the next looking for one I believe is the real deal. In Theravada there are so many agreed upon texts and step by step instructional guides that this isn't an issue. If a teacher isn't teaching something fairly close too what's in the Pali Canon, it's pretty much safe too walk out. Or if they are breaking rules or acting in ways that are not acceptable according to the Canon, again, it's safe to say "this isn't right."
Whereas in Zen, your teacher can smack you with a stick, ZERO support for violence in the sutras, and it's a good teaching method! People reach enlightenment from this kind of thing. But then i'm sure there have been "masters" who are just violent, unenlightened people who like hitting their students, so how do we know the difference?
or from a non-violent example, there are Zen masters who teach methods that are not talked about in the sutras, that supposedly work wonders. and "masters" who teach methods not found in the sutras, that do nothing, again, how do we know the difference?
Can anyone explain all of this?

