Hi Tommy,
Here's how I understand the various meanings:
Fruition In the language of emptiness: empty of sense input, empty of memories, empty of plans, empty of thoughts, empty of a sense of time passing, empty of a sense of space, empty of a sense of presence, empty of an observer, empty of what-have-you.
(Fruition in the language of causality/conditions: it comes as a complete surprise (i.e. can't be "caused"), it doesn't affect memory, sense of presence etc., and is not affected by it, and so on; the moment after it follows from the moment before it - the unconditioned).
(Fruition in terms of Truth with a T, as in True Self: "Death is
nothing to us", as Epicurus observed. The Deathless. Etc.)
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In cognizing only the cognition - No sense of "I think therefore I am". Just thoughts. No sense of "I see therefore
I am seeing - just images. (Not images seen by a seer). The body does what it is able to do (see, hear, smell, stand upright, drive a car, type at a computer); the mind does what it is able to do (form thoughts and concepts, manipulate symbols, interpret language). All this is natural, elegant, beautiful in a way (but not Hollywood-violins-beautiful, not hot-babe-beautiful), perfect in the sense of it being what it is, not what it should or should not be; there are no strings attached, no puppet master behind the scenes pulling at the hands and looking out of the eyes.
In short: empty of all the scheming, agendas, regrets, fears, desires, aversions; empty of the hiding, masking, shielding, tuning outs and other assorted delusions; empty of all the tedious harmful crap resulting from intention based on greed, aversion, and delusion. Empty in the sense of not holding any secrets, dirty or otherwise.
(In terms of conditionality: the case where there is no ignorance; in the absence of ignorance, ultimately, suffering does not arise. Dependent non-arising, or whatever you want to call that enumeration)
(In terms of Truth: Not lacking truth, ignorance is eradicated - or True Will.)
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Can't comment on Nirodha Samapatti.
Cheers,
Florian