Non-duality is an inevitable consequence of quantum theory. The philosophical expression of quantum mechanics is that the “thing-in-itself” is pure potentiality and is actualized only from outside itself by something other than itself.
Pure potentiality cannot actualize itself. The other actualizing agent may be a consciousness, an observation, measurement, or interaction with an environment.
Defining the totality as a quantum system, whether it be our universe alone or infinite universes, this totality by definition remains always and forever in pure potentiality, for there is nothing outside it in order to actualize it.
This means that our universe was never created; it is not: It is pure appearance and has no substantial reality.
In a state of pure potentiality nothing is preferred to another; there can be no distinctions; there is no duality in pure potentiality: If we accept the truth of quantum mechanics, then we have to accept that the underlying reality is essentially non-dual.