Why not?
If we don't know what the spiritual is made of, how can we conclude anything about future observations of it?
We may just find that the spiritual isn't unknowable in composition, just like we learned more about the microcosmos through quantum mechanics.
We may find that classical physics doesn't apply objectively to the spiritual just like it doesn't apply to the sub-atomic particle-wave world ... and that, likewise, quantum mechanics does apply.
Schrodinger's equation has provided us with a way of "seeing" the quantum mechanical world without actually observing it's effective invisibility.
Some even think that consciousness itself is quantum mechanically based -- the quantum mind.
But intuitively, we know ... we know that everything that exists is composed of something, without exception ... no matter how small, or large ... or different.
With that as a truthful given, it's okay not to know the answer ...
... Even though the answer does exist.
I, however, think the answer is knowable, and, within our immediate grasp.
