Absence of thought does not mean a blank.
There must be someone to be aware of that blank. Knowledge and ignorance pertain only to the mind and are in duality, but the Self is beyond them both. It is pure Light.
There is no need for one Self to see another.
There are no two selves.
What is not the Self is mere non-self and cannot see the Self. The Self has no sight or hearing; it lies beyond them, all alone, as pure Consciousness.