Mandukya Upanishad
With an Advaita Commentary from our Understanding
by Kenneth Jaques | 31,733 words
The Mandukya Upanishad is a short, just twelve verses, description of the material manifestation and the eventual return to unmanifest form of the Universe....
Verse 7
7. The immortal does not become mortal, nor likewise the mortal immortal. There would not be under any circumstances, a change otherwise of one´s nature.
The further logical assertion is made that an immortal entity does not become mortal because that means it never was immortal. The opposite logic also applies, the mortal cannot become immortal because the immortal cannot have a history of mortality, the immortal cannot undergo change.