Several years ago, I stumbled across this lovely little Zen poem. The book in which I read it did not name the author, but now, thanks to Google, I can attribute it to Cathy Preston:
"A Gatha for Your Journey"
Whenever the work of saving all sentient beings
Becomes too much for this present moment, I vow with all beings
To breathe in the grace of the morning star
And remember that they are really saving me.