Acharya Prashant explains that the opening of the Upanishads represents an exalted and uninhibited expression of the deepest human desire for freedom, clarity, and truth. He defines the word 'Upanishad' as the event of intimacy or proximity that occurs when the mind comes close to the truth. The mind, which is characterized by a continuous lack of fulfillment and discontent, is confronted with the novel and path-breaking concept of all-pervasive fullness. This idea is entirely contrary to the mind's usual experience of duality and lack, serving as a shock to the student's habitual way of thinking.