योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-211, verse-15

न भात्येवासंविदितमस्ति नास्ति न चोद्यता ।
शून्यं ह्यप्रतिघं चैतत्पराकाशमरोधकम् ॥ १५ ॥

na bhātyevāsaṃviditamasti nāsti na codyatā ,
śūnyaṃ hyapratighaṃ caitatparākāśamarodhakam 15

15. It does not exist in our unconsciousness, nor does it appear to be in existence or otherwise it is not dull, insensible and unthinking beings; it is a vacuity and nullity, and utterly an intangible and imperceptible thing in our sensibility and unconsciousness of it.