I agree, Testy, the experience of an idea is absolute (is that what you mean when you say that all ideas are absolute to a certain degree?). But I am not endorsing (the ideology of) Absolutism as a system of ideas. I am saying that experential immediacy is absolute, but ideas are intermediate constructions, "referring" (as do all symbols) to something else; they are not absolutes.
Miklos, members of this philosophy forum have almost exhausted the topic of brain versus mind. To me, the dualism is not very helpful. We can't have mind, I think, without a brain; and the idea of "brain" is itself an expression of mind. Yin-Yang
I see that your last sentence shares my position.