Whatever appears and disappears is myth (universe or duality or mind). But to what this myth appears is within the myth , as its formless substance, and it is apart from myth as its formless witness. It is apart because it is not an entity or identity within the myth. That formless substance and witness of myth is consciousness . And consciousness is the true self.
When the formless substance and the formless witness of myth is Atman(spirit or consciousness), there is no second thing exists in myth (diversity) other then consciousness , hence it is non-dual.
Thus, whatever appears as real is unreal on the standpoint of the consciousness as self. The unreal (world) is created out of real (consciousness), sustained by real, finally it dissolves as real.
Therefore, the real and unreal are one in essence. The true self itself is the guru, because the myth [world] is created out of the real (consciousness). to realize this ultimate truth or Brahman, the scriptures are not needed.
All these experiences as father, son, guru, and pupil were one and the same consciousness appearing differently. All these distinctions disappear in the ultimate truth.
In dream the mountain which is apparently insentient and material, is nevertheless still your mind alone. Whether living or dead, conscious or unconscious thought or matter; all things are appearances of one and the same consciousness. All these distinctions are seen by Gnani as only the consciousness.
The words are used only communication purpose. The look of an object will depend upon the medium through which the observer views it. In fact, our mental and intellectual conditions will determine the phenomenal world observed and experienced. The ignorant viewing the world confronting him sees it different from a Gnani viewing the same world. Each one of us interprets the world one sees in terms of his existing knowledge. A Gnani sees world and its contents as the illusory play as consciousness whereas ignorant sees the world and its contents as reality.
Without realization of the ultimate truth or Brahman man remains as ignorant of the ultimate truth or Brahman. Without realization of ultimate truth, the seeker remains as seeker. On physical plan there is seeker, seeking and destination but from ultimate standpoint there is neither seer, seeking and or destination.
The words may give different meaning at different level of understanding. As one moves deeper and deeper one realizes the thought, thinker, words and the world are one in essence. Thus in the realm of truth the thought and words become meaningless.
When one who has realized that which lies beyond form, time and space does not give impotence to thoughts and words which has value only in falsehood.
World is both real and unreal. It is real because it is a manifestation of consciousness, but is unreal, in the sense, that it is not absolute and eternal like consciousness itself.
Peoples approach is more practical, and they stuck with the reality of the world, they take it as real. That is why all the confusion.