8.20 परः higher, तस्मात् than that, तु but, भावः existence, अन्यः another, अव्यक्तः unmanifested, अव्यक्तात् than the unmanifested, सनातनः Eternal, यः who, सः that, सर्वेषु all, भूतेषु beings, नश्यत्सु when destroyed, न not, विनश्यति is destroyed.

Commentary:
Another unmanifested in the ancient or eternal Para Brahman Who is distinct from the Unmanifested (Avyakta or Primordial Nature), Who is of ite a different nature. It is superior to Hiranyagarbha (the Cosmic Creative Intelligence) and the Unmanifested Nature because It is their cause. It is not destroyed when all the beings from Brahma down to the ants or the blade of grass are destroyed. (Cf.XV.17)