If a mendicant depends on mental development in order to gain immersion, gain unification of mind, this is called immersion due to mental development. They generate enthusiasm, try, make an effort, exert the mind, and strive so that bad, unskillful qualities don’t arise … so that skillful qualities that have arisen remain, are not lost, but increase, mature, and are fully developed. These are called active efforts. And so there is this mental development, this immersion due to mental development, and these active efforts. This is called the basis of psychic power that has immersion due to mental development, and active effort.
If a mendicant depends on inquiry in order to gain immersion, gain unification of mind, this is called immersion due to inquiry. They generate enthusiasm, try, make an effort, exert the mind, and strive so that bad, unskillful qualities don’t arise … so that skillful qualities that have arisen remain, are not lost, but increase, mature, and are fully developed. These are called active efforts. And so there is this inquiry, this immersion due to inquiry, and these active efforts. This is called the basis of psychic power that has immersion due to inquiry, and active effort.”
Linked Discourses 51.14 2. Shaking the Stilt Longhouse With Moggallāna
So I have heard. At one time the Buddha was staying near Sāvatthī in the stilt longhouse of Migāra’s mother in the Eastern Monastery. Now at that time several mendicants were staying beneath the longhouse. They were haughty, insolent, fickle, scurrilous, loose-tongued, unmindful, lacking situational awareness and immersion, with straying minds and undisciplined faculties.
Then the Buddha addressed Venerable Mahāmoggallāna, “These spiritual companions of yours staying beneath the longhouse are haughty, insolent, fickle, scurrilous, loose-tongued, unmindful, lacking situational awareness and immersion, with straying minds and undisciplined faculties. Go, Moggallāna, and strike awe in those mendicants!”