Bhagavad Gita, Chapter 13, Verse 23

And the Supreme Purusha in this body is also called the Looker-on, the Permitter, the Supporter, the Experiencer, the Great Lord, and the Highest Self.

A second, real presence is named here inside the very same body, distinct from the soul experiencing it.

Naming this presence as witness, permitter, and supporter draws a real, careful line between the soul that experiences and the source that quietly oversees. Two real roles, not one, are shown sharing the same space.