Māṇḍūkya Upanishad with Swami Viditatmananda
This Upaniṣad is an exposition of the meaning of the sacred syllable Om. By analyzing the three states of human experience—waking, dream, and deep sleep—this Upanishad reveals that the meaning of Om is all that is, and that is you. You are not the waker, etc., that you think you are. You are free of all three, none of them exists without you, and you are all of them.
Aparokshanubhuti 56 onward with Swami Muktatmananda
Aparokshanubhuti by Acharya Sri Adishankara is a complete text of Vedanta, detailing all that is involved in gaining self-knowledge. The selected verses describe the nature of self-knowledge itself.
Meditation with Swami Muktatmananda