Bhagavad Gita Chapter 11.18
tvam akṣaraḿ paramaḿ veditavyaḿTranslation
tvam asya viśvasya paraḿ nidhānam
tvam avyayaḥ śāśvata-dharma-goptā
sanātanas tvaḿ puruṣo mato me
You are the supreme primal objective. You are the ultimate resting place of all this universe. You are inexhaustible, and You are the oldest. You are the maintainer of the eternal religion, the Personality of Godhead. This is my opinion.