योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-62, verse-25

न केवलं तु तद्दृश्यं यावत्तु विषये वयम् ।
जगच्चेदं खमेवाच्छं यथा तन्नस्तथाखिलम् ॥ २५ ॥

na kevalaṃ tu taddṛśyaṃ yāvattu viṣaye vayam ,
jagaccedaṃ khamevācchaṃ yathā tannastathākhilam 25

25. Not only is that sight, but whatever is the object of any of our senses, and the whole world itself, is the clear and open sky.