From Chapter 22 ("Time Unfolds") of Subtle Sound: The Zen Teachings of Maurine Stuart:

The first rule of zazen, handed down from generation to generation, is to have compassion for all beings, and a deep longing to save all of them. We must practice samadhi meditation with great care, promising to ferry all sentient beings over to the other shore. We refuse to practice zazen only for our own emancipation. At the end of each of our activities together, we chant the Four Great Vows, beginning with the vow to save all sentient beings. This vow is based on the fact that we are one with all beings.

(cf. 01 (2013-11-05), Mantra - Ditto (2015-08-30), Mantra - No Others (2016-06-27), Mantra - We Are One (2017-04-18), ...) - ^z - 2017-07-22