“There are many texts on Yoga and Yoga is
found in one form or another in the Upaniṣat.
Yoga for them is the means to realise God
and OM is the key to that process.
So many Upaniṣad mention OM
because most Upaniṣat are involved with Vedānta
or the movement towards God.”
– TKV Desikachar “The use and abuse of OM”,
Lecture on September 5th 1983 in Zinal, Switzerland