Advaita means not two, One only without a second.+

The whole  philosophy of Sage Sankara can be summed up in the following statement:-

Brahma satyam, jaganmithya, jivobrahmaivanaparah ~Brahman alone is real; the world is non-real; and the individual Self is essentially not different from Brahman.

This is the quintessence of  Sage Sankara’s Advaitic wisdom.

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The Soul, which is present in the form of consciousness alone, is real and the waking experience, which is present in the form of the universe, is unreal. Consciousness is the ultimate truth or Brahman.  

Thus, Brahman is the undifferentiated pure consciousness, devoid of parts, attributes, form, changes, or limitations whatsoever.

 The Advaita is the nature of the Soul. The Soul, the  ‘Self’ is Self-luminous and all-pervading and one only, without a second. 

The Soul, the innermost ‘Self’ is ever-free, pure consciousness. The empirical world is non-real, an appearance born out of ignorance.  

Advaita means not two, One only without a second.  Advaitic truth is beyond form, time, and space. Only the Soul, the  ‘Self’ reveals beyond the form, time, and space. Advaita is of the nature of the pure consciousness. 

This truth is Self-existent and cannot be denied, for to deny consciousness is to actually prove its existence.  Realization of this truth is the goal of the seeker of the truth.

Consciousness is the one single reality. Consciousness is the ultimate truth or Brahman. It then equates this reality with the sole reality of the real existence which is the Soul, which is present in the form of consciousness.:~Santthosh Kumaar