an I/O of duality
I generally write as simplistic as possible, using fairly common terms and concepts (to me). While understanding that the reader is an impossible other on which a writer could gauge what is a common interpretation. Yet, this is as common as it comes, the writer and reader are simply not-two. All disconnects through interpretation, around understanding, is dual. What is the center of all being is united, unwaveringly one, which all comings and goings support it's persistence. These input/output experiences are creation, deep, complex and constantly contiguous.
a proof
I've often been asked to include sited sources to prove or convince the reader that existence is actually dual (and nothing else). But, we currently live in the age of information (approaching a singularity of consciousness, as some have inferred). If a reader needs affirmation about this existence, it's literally everywhere, across writing after writing, it's the only pattern one can rely.
While teaching expressly requires a dichotomy, the learned teacher explaining to the empty student, is an epic understanding of the process from a third view. There is no truly independent teacher/student moment to be had, if you can't know it as an individual, it can't be known. From this we build, to this we go, eternally. Proof of this cannot be manufactured, as it is the essence of all that could be manufactured.
a god or guru
As I've continually alluded (and have out-right expressed), there is no truly independent individual that has ever or could ever subsist apart from this, as assumed. If you want to learn something, some system, some process, be involved. Practice and participate in it's specifics, among the organization of structure. All of this, doesn't exists "somewhere else" at "some other time" with "some other being".