The self is constantly talking about you and which you are. It's a little difficult, but nothing theoretical. What they're talking about is available to you right now. The inquiry into the self will continue until the seventh month of mandukopenition. This is probably the most important mantra in the entire velant text - all openisia literature.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Mantra 2.