योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-63, verse-14

व्योमात्मत्वान्न गगनं न विदन्ति परस्परम् ।
अपि चेतनरूपाणि सुप्तानीव निरन्तरम् ॥ १४ ॥

vyomātmatvānna gaganaṃ na vidanti parasparam ,
api cetanarūpāṇi suptānīva nirantaram 14

14. These notions being as void and blank as vacuum, are not as shadows in the visible sky; nor are they known to one another, and though they are of sensible shapes, yet they are as ignorant of themselves, as it were under the influence of sleep.