“Reverend Sāriputta, there are four ways of practice. What four? Painful practice with slow insight, painful practice with swift insight, pleasant practice with slow insight, and pleasant practice with swift insight. These are the four ways of practice. Which one of these four ways of practice did you rely on to free your mind from defilements by not grasping?”

“Reverend Moggallāna … I relied on the pleasant practice with swift insight to free my mind from defilements by not grasping.”

Numbered Discourses 4.169 17. Practice Extra Effort

“Mendicants, these four individuals are found in the world. What four? One individual is fully extinguished in this very life by making extra effort. One individual is fully extinguished when the body breaks up by making extra effort. One individual is fully extinguished in this very life without making extra effort. One individual is fully extinguished when the body breaks up without making extra effort.