परस्तस्मात्तु भावोऽन्योऽव्यक्तोऽव्यक्तात्सनातनः। यः स सर्वेषु भूतेषु नश्यत्सु न विनश्यति ॥

paras tasmāt tu bhāvo ’nyo ’vyakto ’vyaktāt sanātanaḥ yaḥ sa sarveṣhu bhūteṣhu naśhyatsu na vinaśhyati

Therefore verily there existeth, higher than that unmanifested, another unmanifested, eternal, which in the destroying of all beings, is not destroyed.

In plain words: Beyond that unseen source of the universe there is a higher unseen reality. It is eternal, and it is not destroyed even when all beings are destroyed.