Ramana MaharshiDesire makes even an atom appear as great as Mount Meru before it is achieved, and vice versa after it is achieved, and thus [desire] makes one always poor. Hence we have never seen any bottomless abyss that is as impossible to fill as desire, which can never be satisfied.

Ramana Maharshi

Māṇḍūkya Upaniṣad Reference Materials:

Video/Audio Lectures

Swami Tadatmananda
8 classes (~60 mins each)

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

Swami Sarvapriyananda
4 classes (~60 mins each)

Swami Anubhavananda
6 classes (~75 mins each)

Mandukya Upanishad (Agama Prakarana)2 of 6 @ Bengaluru 2015 (English) 03683 NR YTC

Swami Sarvapriyananda
Who Am I? (~90 min talk) (Intro only. Must compliment with others below.)

Swami Sarvapriyananda at IITK - "Who Am I?" according to Mandukya Upanishad-Part 1

Swami Tattwamayananda
44 classes (~60 mins each)

Mandukya Upanishad Class 2 - The Reality is Within You

Swami Rama
8 classes (~75 mins each)

Mandukya Upanishad (2/8) Swami Rama

Swami Paramananda Bharti
~15 classes (~90 mins each)

001 Mandukya Upanishad