Manduka Upanishad,:~ All indeed is, this Brahman(God); This Atman is Brahman(God in truth).+

Upanishad itself declares: ~ sarvam khalvidam brahma - all this (universe) is verily Brahman. By following back all of the relative appearances in the world, we eventually return to that from which it is all manifest – the non-dual reality (Chandogya Upanishad). 

In Manduka Upanishad Brahman and Atman are defined as the same.

Isha Upanishad:~  The Self is one. Even still, the Self is Swifter than thought, swifter than the senses. Though motionless, he outruns all pursuit. Without the Self, never could life exist.

Tripura Rahasya, 18: 89:~ Second-hand knowledge of the Self-gathered from books or Gurus can never emancipate a man until its truth is rightly investigated and applied; only direct realization will do that. Realize yourself, turning your attention inward.

Chandogya Upanishad:~ One who meditates upon and realizes the 'Self' discovers that everything in the cosmos-- energy and space, fire and water, name and form, birth and death, mind and will, word and deed, mantrams and meditation--all come from the Self.

Upanishads: ~ They alone in this world are endowed with the highest wisdom who are firm in their conviction of the sameness and birthlessness of Ataman. The ordinary man does not understand their way. (Chapter IV — Alatasanti Prakarana 95-P-188 in Upanishads by Nikilanada)

How can you drop yourself when the Self is not you? You and your world are part of the illusion.  Playing with words and emotions is not wisdom. Realizing the truth beyond the form, time, and space,  is very much necessary. 

Sage Sri, Goudpada quotes from the Upanishads: ~ "There's no plurality here"; "The Soul through its powers appears to be many"; "those who are attached to the   creation or production or origination go to utter darkness"; "the unborn is never reborn, for what can produce it?”

In the Bhagavad, Gita Krishna says: ~It is only one amongst thousands of people who strive for spiritual salvation. Even amongst such seekers, it is only the rare person who gets to know “Self” correctly.’ (7.3)

In Manduka Upanishad: ~ Brahman and Atman are defined as the same.

Manduka Upanishad, verse-2:~ All indeed is, this Brahman; This Atman is Brahman.

While Brahman lies behind the sum total of the objective universe, some human minds boggle at any attempt to explain it with only the tools provided by reason. Brahman is beyond the senses, beyond the mind, beyond intelligence, beyond imagination. Indeed, the highest idea is that Brahman is beyond both existence and non-existence, transcending and including time, causation, and space, and thus can never be known in the same material sense as one traditionally 'understands' a given concept or object.

Imagine a person who is blind from birth and has not seen anything. Is it possible for us to explain to him the meaning of the color red? Is any amount of thinking or reasoning on his part ever going to make him understand the sensation of the color red? Similarly, the idea of Brahman cannot be explained or understood through material reasoning or any form of human communication. Brahman is like the color red; those who can sense it cannot explain or argue with those who have never sensed it. :~Santthosh Kumaar