So you should train like this: ‘The services of those whose robes, almsfood, lodgings, and medicines and supplies for the sick we enjoy shall be very fruitful and beneficial for them. And our going forth will not be barren, but will be fruitful and fertile.’ That’s how you should train. Considering what is good for yourself, mendicants, is quite enough for you to persist with diligence. Considering what is good for others is quite enough for you to persist with diligence. Considering what is good for both is quite enough for you to persist with diligence.”

That is what the Buddha said. And while this discourse was being spoken, sixty monks spewed hot blood from their mouths. Sixty mendicants resigned the training and returned to a lesser life, saying:

“It’s too hard, Blessed One! It’s just too hard!” And sixty monks were freed from defilements by not grasping.

Numbered Discourses 7.73 7. The Great Chapter About Sunetta

“Once upon a time, mendicants, there was a teacher named Sunetta. He was a religious founder and was free of desire for sensual pleasures. He had many hundreds of disciples. He taught them a Dhamma for rebirth in the company of Divinity. Those lacking confidence in Sunetta were—when their body broke up, after death—reborn in a place of loss, a bad place, the underworld, hell. Those full of confidence in Sunetta were—when their body broke up, after death—reborn in a good place, a heavenly realm.