Non-duality is not oneness

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

यस्मिन्सर्वाणि भूतान्यात्मैवाभूद्विजानतः।
तत्र को मोहः कः शोक एकत्वमनुपश्यतः ॥ ७ ॥

yasminsarvāṇi bhūtānyātmaivābhūdvijānataḥ |
tatra ko mohaḥ kaḥ śoka ekatvamanupaśyataḥ || 7 ||

When to the man of realization all beings become the very Self, then what delusion and what sorrow can there be for that seer of oneness? (Or — In the Self, of the man of realization, in which all beings become the Self, what delusion and what sorrow can remain for that seer of oneness?)
-Ishavasya Upanishad

Acharya Prashant: To begin with oneness in the absolute sense cannot be seen. Remember here, as we have said multiple times tonight, that the objective of the verses is to educate the mind. So, when the word ‘oneness’ is being used, it is being used in a sense that will be beneficial to the mind.

The mind cannot experience absolute oneness because the mind operates in duality. All experience requires the experienced…