योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-42, verse-4

द्रवत्वमिव कीलाले शून्यत्वमिव चाम्बरे ।
स्पन्दत्वं मरुतीवेदं किमप्यात्ममयं परे ॥ ४ ॥

dravatvamiva kīlāle śūnyatvamiva cāmbare ,
spandatvaṃ marutīvedaṃ kimapyātmamayaṃ pare 4

4. The world is inherent in the Supreme, as fluidity is connate with water, and vacuity is connatural with air. But why and how they are so intimately connected with one another, is quite inconceivable to us.