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Turiya 

Turiya is the mind in quiescence and aware of Self. There is the awareness that the mind has merged in it's source. Whether the senses are active or inactive is immaterial. In nirvikalpa samadhi the senses are inactive. To know implies the subject and object. To be aware means to be thought-free.( Talks 253)- Ramana Maharshi ( from 'Conscious Immortality')