Consciousness means existence.+

Rig Veda: ~ 'Prajnanam Brahma'- Consciousness is the ultimate reality or Brahman or God in truth.

Do not accept any other truth other than consciousness. Consciousness is the ultimate truth. Nothing is real but consciousness. Realize consciousness as the ultimate truth or Brahman or God in truth. Consciousness is everywhere and in everything. Let these words be inscribed in your subconscious.

Remember:~

The Soul is the Self. The Soul is present in the form of consciousness. No division in consciousness is admissible at any time as it is always one and the same. Even the world in which we exist must be known as false, like the delusion of a snake in a rope.

The Soul is the Self. The Soul is present in the form of consciousness. Consciousness is Self-evident. It is not established by extraneous proofs. 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 the  Self in truth.  

Until one thinks that his body as body, ego as ego the universe as the universe, he remains in ignorance because he is still in ignorance and he is unaware of the fact that they too are consciousness.

The Soul, the Self is formless and non-dual, one without a second. It has no other besides It. It is destitute of difference, either external or internal.  The Soul cannot be described because the description implies a distinction. The Soul cannot be distinguished from any other than it. In the Soul, there is not a distinction between substance and attribute. 

Nondual awareness constitutes the very essence of the Soul and not just its attributes.  The Soul is impersonal. It becomes personal,  only through its association with the three states or illusion.

As through ignorance of the real nature of the rope, the very rope appears in an instant as a snake, so also does Soul or consciousness appear in the form of the waking or dream without undergoing any change.

There exists no other material cause of this waking or dream except consciousness. Hence, these three states are nothing but an illusion created out of consciousness.

All the three states are consciousness, because they arise from consciousness, and sustained by consciousness, and finally,  dissolve as consciousness. The idea of the pervaded and the pervading is illusory. When this supreme truth is realized, then there is no room for any distinction between the cause and the effect.

Certainly, there is no manifoldness in consciousness. The non-dual cause being an established fact, how could the three states be different from consciousness, when they are created out of consciousness? :~Santthosh Kumaar