योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-83, verse-29

न चेतति क्वचित्किंचित्कश्चिच्चेत्यात्मभावतः ।
तेन चेतापि नास्तीव मौनमेवावशिष्यते ॥ २९ ॥

na cetati kvacitkiṃcitkaściccetyātmabhāvataḥ ,
tena cetāpi nāstīva maunamevāvaśiṣyate 29

29. There is nothing that ever thinks of anything, nor aught whatever which is thought of or object thereof of its own nature; therefore there is nothing that thinks or reflects, but all is quite rest and silence.