Atman (God in truth) alone exists~ everything is Atman, there exists nothing except Atman. Such a man is extremely rare.+

Knowledge of Self is the knowledge of Atman.  Atman is the ultimate truth or Brahman or God in truth.

 Atman (God in truth) alone exists~ everything is Atman, there exists nothing except Atman. Such a man is extremely rare."

All is consciousness. The whole universe is consciousness. From consciousness, the universe comes. When the universe disappears, the consciousness still remains without form, time, and space

People think everything is energy but without consciousness, how can one know it is energy. It is only intellectual speculation.

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.

The sun, the moon, the stars, planets shine because of the Soul or Spirit. The Soul shines and all things else shine as a result. Everything in the universe reflects but that light of the Soul which is present in the form of consciousness. Merely knowing the truth is not enough to escape from the tangle of illusion.

The mind is in the form of the universe. From the standpoint of the Soul the innermost Self the universe is merely an illusion. The illusion arises from ignorance. Enlightenment comes with detachment from the illusion by realizing the experience of form, time and space are one in essence.

Bhagavad Gita: ~ Brahmano hi pratisthaham ~ Brahman (God) is considered the all-pervading consciousness, which is the basis of all the animate and inanimate entities and material. (14.27).

When Bhagavad Gita says, God is considered the all-pervading consciousness which is the basis of all the animate and inanimate entities and material then everything is nothing but consciousness.

The Soul, the Self, which is present in the form of consciousness, is the substance of the dualistic illusion because the dualistic illusion is created out of consciousness.

Illusion’s "concealing power" merely means that when one looks at an ice block he thinks only of the ice block. But a Gnani will think of the substance of the ice block too. That is a wise man has the knowledge of the substance plus of the ice block.

Similarly, a Gnani has knowledge of the universe and its formless substance also. Consciousness is concealed because of ignorance. As a man, one is not aware of the fact that his body, ego, and his experience of the world are merely an illusion created out of consciousness.

When one becomes aware of the fact that, the universe is an illusion then there is nobody no ego, and no world then there is only the formless Soul or consciousness, which is the innermost Self.

Having turned the visible into the invisible, one should realize everything to be consciousness itself. A Gnani always dwells in nondual awareness in the midst of dualistic illusion (world).

Remember:~

A Gnani has realized he is not he but consciousness; his body is not the body but consciousness, and the world in which he exists is not the world but consciousness. Everything known, seen, believed, and experienced by him is nothing but consciousness then what else remains, which is not consciousness. 

There is nothing else to realize other than to realize that consciousness alone is, everything else is merely an illusion created out of consciousness.

The look of an object will depend upon the medium through which the observer views it. In fact, our mental and intellectual conditions determine the world, observed and experienced. The commoner viewing the world will see differently from a Gnani viewing the same world. Each one interprets the world that they see in terms of their existing knowledge. The commoner sees everything based on the ego, therefore, experiences birth, life, death, and the world as a reality, whereas a Gnani sees everything as consciousness and he is fully aware of the fact that, there is no second thing that exists other than the Soul or consciousness. 

Thus, all egocentric knowledge has to be bifurcated to realize the ultimate truth, which is beyond form, time, and space.

The world in which we exist is nothing but an illusion created out of the Soul, which is present in the form of consciousness.

The whole universe is nothing but the Soul. Therefore, there is no second thing that exists other than the Soul, which is present in the form of consciousness.

It is not as if something that was not consciousness suddenly becomes consciousness. Rather, "knowing the truth” means the removal of ignorance about one's own existence as the consciousness. Thus, to "know the truth” is to "be  consciousness."

Third Mundaka - Chapter 1 (8) - Brahman (Self) is not grasped by the eye, nor by speech, nor by the other senses, nor by penance or good works. A man becomes pure through the serenity of intellect; thereupon he beholds the 'Self' which is without parts.

Consciousness is ever-present. Without consciousness, the world, in which you exist ceases to exist. The consciousness is Self-evident. It is not established by extraneous proof. It is not possible to deny consciousness because it is the very essence of the one who denies it. Consciousness is the basis of all kinds of knowledge, presuppositions, and proofs. Consciousness is everything. Thus, consciousness is the ultimate truth or Brahman. : ~ Santthosh Kumaar