How Zen's authentic self is different from Buddhism and Zazen
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Authentic self... According to who?
Buddhists believe that you don't have a self. As a religion they get to make up whatever they want and part of convincing you to be a part of the Buddhist religion is promising you that you don't really have a self.
Zazen is an indigenous Japanese religion that promises people freedom that only exists within the religious practice. Dogen, the messiah of Zazen, tells his followers that you can't be yourself when you're confused by life. Now granted he wrote that when he was in his early 20s and he gave it up after less than a decade but that's the Doctrine of the Shikantaza Church
What about Zen?
Zen masters teach that you're always yourself, whether you know it or not.
Zen is the only tradition that follows Buddha's sudden permanent enlightenment, an enlightenment is only possible if the preconditions for it are ever present.
Zen's self is directly experienced. It's not known so there can't be a doctrine about it because every doctrine and every teaching is about knowing.
As knowing is subtracted and experience is emphasized, we get farther and farther away from things that sound true and closer and closer to "If you haven't been in love, you're just not going to understand it."
Yunju Zhi's no seer
Clearly seeing like this is then called seeing the nature. Nature is Buddha; Buddha is nature. Therefore it is said: seeing the nature, becoming Buddha.”
[The monk] said: “Since the nature is pure and does not belong to being or nonbeing, because of what is there seeing?”
The master said: “Seeing, with nothing that is seen.”
[The monk] said: “Since there is nothing seen, why further is there seeing?”
The master said: “The place of seeing also is not.”
[The monk] said: “At the time of seeing like this, whose seeing is it?”
The master said: “There is no one able to see.”
[The monk] said: “Ultimately, how is this principle?”
The master said: “Do you know? Falsely reckoning it as being, then there is subject and object; only then does it get the name ‘confusion.’
Now a warning?
Not being able to explain love to somebody who has never been in love doesn't mean that love doesn't exist.
The problem is that people try to apply this same logic to stuff that actually doesn't exist, like God and the supernatural and higher states of consciousness and telepathy and meditative or lsd insight.
The key difference is there are real people who have been enlightened but there are no real people that have had any of that other stuff. If you can encounter it in real life and bring it out, show it to everybody, then the fact that it exists like love but cannot be explained is plausible.
No doctrine required.