Sorry, it's taken so long to respond.
We would be able to speak truthfully about that which lies outside the pale of meaning, but, despite our speaking truthfully, we literally would not be able to make sense of these truths. — csal
The spirit of The Gem - backlit by the reflections preceding its introduction in the treatise - is an attempt to force the reader to try to conceive of something without incorporating elements that can
only derive from experience (encounter/appearing-to/etc.)
If we wish to think of things or events occurring outside the ambit of possible human experience, we cannot incorporate a single such element. In the circumstances we wish to conceive, there will be no-one to whom the object will appear - no one who will experience the event - so the presence of any such element would indicate that the entire conception is a fantasy which occludes the observer its smuggled in (like the Freudian fantasy of watching one's own conception, a moment during which one must necessarily be absent.) Again, the point is not that one can't think of something one isn't thinking of because one is thinking of it. The point is that one can't use elements that only come about
through experience to conceptualize a situation that irrecusably (lol) precludes any such thing.
Since what's being excluded is that which derives from a (finite)
perspective, it's natural to hone in on those elements which relate to vision. But, to my mind, what's most difficult is the exclusion of experienced
time. Of course we can say that a year refers to nothing but the earth's rotation around the sun and, as such, will hold just as well absent sentient beings (the earth will still revolve.) But drop the passage of time as experienced and just how quickly
does the earth revolve around the sun? We can certainly compare this duration to other durations, but we can't quite grasp what any of it means without bringing it back to our
experience of some particular duration. And that experience is always relative to the temporal scale we inhabit (cf Kant's
Critique of Judgment, the relevant section of which I'm too lazy to produce at this moment. But I'll furnish it if pressed.)
How rapidly do events happen in our absence, in the absence of any experience? In a sightless, soundless, tasteless, touchless world with no perspective from which to establish a spatial or temporal scale, how do the experienceless postsentient years unfurl? Try -
really try - to imagine this.
I suspect this line of thought gets flak because of how simple and naive it is, accessible to even the non-specialist (if a tree falls...). Nevertheless, I can see no way past it.
So, absolutely, we can create a web of inferences from statements/facts about that which lies beyond experience, but the real question is: If we pause for a second, do we really have a sense of what we're talking about? Are we not tacitly making use of the scales and perspectives we inhabit in trying to understand the truths we utter?
Much of this comes back to one's concept of 'concept.' I take the Kantian view that a concept without intuition is empty - imagination is necessary. I gather that for Brassier/Sellars, a concept is something like a move in an inferential game. And this is what I was getting at with the idea of 'secular speaking-in-tongues.' Like Zizek's 'symbolic real' - We can do the math, we can see what checks out and what doesn't, but that doesn't mean we have any grasp of what we're talking about.