'I' is present in the form of the mind. The mind appears as the universe.+

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, mantram and meditation--all come from the Self.

The ‘I’ hides the truth of the whole. The realization of ultimate truth or Brahman is possible only when the seeker inquiries into the nature of the ‘I’.

 'I' is present in the form of the mind. The mind appears as the universe.

There was no mind in deep sleep. As soon as waking takes place the mind appears. The mind is present in the form of the universe. 

The universe appears as the waking or dream. The waking is a parallel dream, and the dream is a parallel dream.

The man – confronts the universe in the waking or in a dream. The waking or the dream appears as a whole and disappears as a whole. 

To examine it closely, one has to analyze the three states and mentally trace the witness of the three states. The witness of the three states is formless and apart. The witness is hidden within the three states as their formless substance and it is apart from the three states as their formless witness.

The witness is the invisible Soul, the  Self. The invisible Soul, the  Self is present in the form of consciousness. In the realm of truth, the formless substance and witness are one in essence. That essence is consciousness. 

Thus, there is no second thing other than consciousness. Thus, consciousness alone is real and the universe is merely an illusion created out of consciousness.

The universe (mind), which appears and disappears, is only form and shape is created out of consciousness and nothing else. Consciousness alone is positive proof.

From the standpoint of the invisible Soul, the Self, one becomes aware of the falsity of this mind (universe), which is a mere appearance. 

The one which appears as the mind (universe) and disappears as no mind (Soul) is consciousness alone. Therefore, the mind and Soul are one in essence.

The mental analysis shows that, the existence of the formless witness, which witnesses the coming and going, of the three states without a break. 

On deeper analysis, is found to be that changeless, Soul or consciousness itself. : ~Santthosh Kumaar