It is quite impossible for a mendicant who is developing and cultivating the four kinds of mindfulness meditation to resign the training and return to a lesser life. Why is that? Because for a long time that mendicant’s mind has slanted, sloped, and inclined to seclusion. So it’s impossible for them to return to a lesser life. And how does a mendicant develop and cultivate the four kinds of mindfulness meditation? It’s when a mendicant meditates by observing an aspect of the body … feelings … mind … principles—keen, aware, and mindful, rid of covetousness and displeasure for the world. That’s how a mendicant develops and cultivates the four kinds of mindfulness meditation.”

Linked Discourses 52.9 1. In Private In Ambapālī’s Mango Grove

At one time the venerables Anuruddha and Sāriputta were staying near Vesālī in Ambapālī’s Mango Grove. Then in the late afternoon, Sāriputta came out of retreat, went to Anuruddha, and said to him: