Kaltxн Moonbeam! I need your help

again - and again, on Buddhism!
The Lotus Sutra that you sent works really magic for me, I listen to it regularly - but with respect, otherwise it blows me away to Pandora!

that's fine - but I don't want to go back...

My question is about one saint who swore Not to accept (?) the enlightement until all, even the baddest, the darkest, & most miserable souls are at least given a chance to learn Buddha's way - and have the choice. I think he was even trying to educate demonios.
Do you remember this saint? I definitely saw his mantra on YouTube, but it was long ago, and I don't remember his name anymore... But I usually deal with difficult people & situations, so I would ask him for help, definitely!
Now if You can help me to find his mantra - I will be very grateful
