"Via the lotus-stem-thread of the mouth, relinquish breath - meaning: make it Still; in this way - via the sushumna path, it becomes Still like this spontaneously. This is the indication of 'kumbhak' - meaning: vayu moves in Stillness via the sushumna; that is the state of kumbhak."
"Sreshtha uttamanga [the greatest and principal part of the body] (mouth)* brahmin" - when there is samadhi; the abode of all happiness is "swarga" [heaven]; when one performs Kriya, one is a "brahmin"; from that Mouth - Lord (Purushottama).**
[*and**Translator's note: The parentheses and the text within them are in the original.]
Points of Kriya as given by Yogiraj Shyama Charan Lahiri Mahasaya from His introduction to the Gita:
- Pranayam;
- seeing Yonimudra in the Eye;
- tongue going to the head;
- staying in the Bindu and listening to the Sound;
- keeping the star from the throat to the forehead