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

Aitareya Upaniṣad Reference Materials:

Video/Audio Lectures

Swami Paramarthananda
14 classes (~55 mins each)

Swami Nikhilananda
7 classes (~75 mins each)

Aitareya Upanishad - Introduction, Ch 1, Sec 1 - Shloka 2 to 4