I do not do this lightly, but I will break my self-imposed, post-
kuvasz silence here because
twyvel finally said something that I understood!
If "all is one," then how do you know that?
Certainly, if you're serious in suggesting that everything is a unity, then presumably you can't distinguish yourself from anything else. If the "I" is not contrasted with the "not-I," then you can have no self-awareness (as Fichte pointed out), but, more importantly, you can have
no awareness at all. Either everything is "you," in which case all your perceptions are nothing more than self-reflections (and thus you resemble nothing so much as a Cartesian "brain in a vat"), or you are committed to a type of solipsism -- and I see no reason to argue with a solipsist who doesn't agree with
me.
If, on the other hand, you are positing this "all is one" in some sort of metaphysical "we're all connected" kind of way, then your proof fails, since any such proof rests on an implicit acceptance of the "not-I." In particular, your notion that there is no "observable self" cannot rest on mental experience, since "observation" and "experience" are either direct sensory knowledge, and thus manifestations of a mind that recognizes the "not-I," or else they're the idle musings of a solipsistic potted brain.
In sum, your "all is one" can only rest on a metaphysical basis, not an epistemological one. And you can no more "prove" your metaphysics by means of logic than I could "prove" the existence of God by the same methods.