The 22 levels from earth to sky refer to the development of the Wish for Budhahood (Bodhichitta), from the initial intention in a baby Bodhisattva to the full Bodhichitta in the mind of a Buddha.
This is from the Ornament of Realizations (Abhisamayalankara) by Arya Asanga, and a commentary by Je Tsongkapa called the Golden Garland.
This was a teaching requested by one of Geshe Michael’s students and taught in a small private class in his hotel room in the wee hours of April 22, 2016 in Beijing. It’s taught in English with Chinese interpretation.
