योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-83, verse-24

यथा स्वप्ने चिदेवान्तः पुरपत्तनवद्भवेत् ।
पुरादि न तु तत्किंचिद्विज्ञानाकाशमेव तत् ॥ २४ ॥

yathā svapne cidevāntaḥ purapattanavadbhavet ,
purādi na tu tatkiṃcidvijñānākāśameva tat 24

24. As the intellect appears itself, like the inward city it sees within itself in a dream; so there is nothing in real existence any where, except the knowledge thereof, which is inherent in the intellect.