Conversation

Sane interpretation of no-self: the self is an illusion, so I don't have to believe thoughts derived from having one. Real-world interpretation of no-self: the self is an illusion, so if you use personal pronouns or have personal preferences, this means you are not awakened.
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Everything. Generally you mean the sense of separate, defined me-ness is the illusion, not the person itself, so... Some make more extreme ontological statements ("nothing is real"...), but, they're pretty much optional (and quite possibly also illusions).
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Certainly. Now find it in yourself. The strong ontological statements - that I tend to ignore - are mostly asserting something like an absolute universal self (like your mythical Empyrean) or whatever, so they don't necessarily conflict.
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You can't find yourself. Each time you think you have you are not you. You have retreated in a tighter Self. Arguably you can continue the process until You find an irreducible Self, and even go past it and dissolve the Self. I prefer to incorporate more, than shed layers
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