योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-38, verse-13

तेन तत्र कर्तुरकर्तुर्वा नित्यमसंसक्तं भवतु चेतो नहि किंचिदस्त्यात्मतत्त्वव्यतिरिक्तं यत्र संसक्तिर्भाव्यते ।
यत्किंचिदिदं जगद्गतं तत्सर्वं शुद्धचित्तत्वादाभासमवेहि ॥ १३ ॥

tena tatra karturakarturvā nityamasaṃsaktaṃ bhavatu ceto nahi kiṃcidastyātmatattvavyatiriktaṃ yatra saṃsaktirbhāvyate ,
yatkiṃcididaṃ jagadgataṃ tatsarvaṃ śuddhacittatvādābhāsamavehi 13

13. Hence whether a man is the doer of an action or not, he perceives nothing of it, when his mind is engrossed in some other thought or action; but he views every thing within himself, who beholds them on the abstract meditation of his mind. The thinking mind sees the outward objects, as reflections of his pure intellect cast without him.