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This empty consciousness is the same as what is called Brahman. Some call it knowledge and others an empty vacuum. 

Some call it the spirit, and others use the term embodied spirit (puruṣa). Others call it the empty Intellect, and Shaivites give it the names of Śiva and the soul.. 

Oṃ Śri Gurubhyo Namaḥ Hariḥ Oṃ

Maharṣi Vasiṣṭha in Yoga Vasistha Maharamayana