Going through Saḷāyatanasaṁyutta to see if I could find anything interesting, we have SN 35.30 as an interesting oddity.
And what is the practice fit for uprooting all conceiving?
It’s when a mendicant does not conceive anything to be the eye, does not conceive it in the eye, does not conceive it as the eye, and does not conceive that ‘the eye is mine.’ They don’t conceive anything to be sights, they don’t conceive it in sights, they don’t conceive it as sights, and they don’t conceive that ‘sights are mine.’ They don’t conceive eye consciousness … eye contact … They don’t conceive anything to be the pleasant, painful, or neutral feeling that arises dependent on eye contact. They don’t conceive it in that, they don’t conceive it as that, and they don’t conceive that ‘that is mine.’
Now, this looks remarkably like MN1, but with some crucial differences.
When MN1 blames maññeti, and then counters it with “They directly know…” (abhiññāya), this part is completely missing in SN 35.30.
Second of all, there’s the three valences of vedana in SN 35.30 that is completely missing in MN1.
SN 35.31, the very next sutta, has:
For whatever you conceive it to be, whatever you conceive it in, whatever you conceive it as, and whatever you conceive to be ‘mine’: that becomes something else. The world is attached to being, taking pleasure only in being, yet it becomes something else.
So we need to circle back to what mano / maññeti mean.
Today, it’s more or less crystallized as taking something as self, as per MN1. However, that seems like a pedagogical shorthand, rather than covering the entire lexical usage of the words. Indeed, in many places, maññeti is used in a general sense (and even in a positive sense, in a few examples I should’ve noted down!).
Additionally, SN 22.89 has good reasons for us to question that maññeti should exclusively mean “Conceiving with regards to a self”. In this sutta, Ven. Khemeka says:
“I do not regard anything among these five aggregates subject to clinging as self or belonging to self, yet I am not an arahant… The notion ‘I am’ has not vanished, though I do not regard anything as ‘This I am.’”
So it seems Khemeka doesn’t regard anything in MN1 as self, but he’s still not an arahat.
Direct knowledge part comes in SN 35.80:
“Take a mendicant who has heard: ‘Nothing is worth insisting on.’ When a mendicant has heard that nothing is worth insisting on, they directly know all things. Directly knowing all things, they completely understand all things. Completely understanding all things, they see all signs as other. They see the eye, sights, eye consciousness, and eye contact as other. And they also see the pleasant, painful, or neutral feeling that arises dependent on eye contact as other. …
They see the mind, ideas, mind consciousness, and mind contact as other. And they also see the pleasant, painful, or neutral feeling that arises dependent on mind contact as other. That’s how a mendicant knows and sees so as to give up ignorance and give rise to knowledge.”
This is one of the suttas that can be read as an epistemic insight on the fallibility of dharmas as ideas, and unreliability of signs; or a simple rejection of phenomenon because it just doesn’t belong to a self.
Bhante Sujato notes that “Other … is a term for non-self.” But, I wonder if that’s too restricted a reading.
How Sunyata is understood as regarding absence of self in Dharmas (Theravadin) vs absence of any signs to any phenomenon (Mahāyāna) is a topic of tension, it seems the same tension can be felt in the EBTs and indeed with Māyājāla Sūtra; which, while still emphasising not-self, its rejection goes beyond the mere absence of a self in the observed phenomenon.
With it and rest of the post-canonical literature talking about it, we can see how Buddhists might’ve understood maññeti beyond merely talking about appropiration with regards to a self.