Nisargadatta MaharajDesire not, fear not, observe the actual, as and when it happens, for you are not what happens, you are to whom it happens. Ultimately even the observer you are not. You are the ultimate potentiality of which the all-embracing consciousness is the manifestation and expression.

Nisargadatta Maharaj

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