Ramana MaharshiIf one remains merely as consciousness [that is, as ‘I am’] ignorance will not exist. Hence, ignorance is false; Self-consciousness alone is real. When correctly known, it is ignorance to say that there is ignorance. Verily, pure consciousness is our nature. Thus should you know.

Ramana Maharshi

Chāndogya Upaniṣad Reference Materials:

Video/Audio Lectures

Swami Paramarthananda
77 classes (~55 mins each) 1, 2, 3, 4, 5, 6, 7, 8

Swami Brahmarupananda
2 talks (~55 mins each)

Swami Viditatmananda
359 classes (~75 mins each)

02 Chhandogya Upanishad

Swami Krishnananda
21 classes (~50 mins each)

Neema Majmudar
28 classes (~90 mins each)

Rishikesh Retreat of Chandogya Upanishad class 1 part 1 by Neema Majmudar