“Mendicants, 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.”

Numbered Discourses 4.162 17. Practice In Detail

“Mendicants, 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.

And what’s the painful practice with slow insight? It’s when someone is ordinarily full of acute greed, hate, and delusion. They often feel the pain and sadness that greed, hate, and delusion bring. These five faculties manifest in them weakly: faith, energy, mindfulness, immersion, and wisdom. Because of this, they only slowly attain the conditions for ending the defilements in the present life. This is called the painful practice with slow insight.