The dream is the projection of the mind. Everything of the dream enjoys the same degree of reality. Yet some person, thing or transaction of the dream has the special power to wake us up.
The seventh chapter of the Chandogya Upanishad, which is a dialogue between the great Sage Sanatkumara and his younger brother, turned disciple, the famous Narada, makes us realize that all knowledge is the play of words alone- name eva etat. Yet the words of the text have the unique power not only to prepare us but also finally awaken us to our infinite nature, which alone is all bliss bhumaiva sukham.
Swamini Vimalananda has added relevant notes to make the subject easier to grasp.