Chandasamādhisutta
“Chandañce, bhikkhave, bhikkhu nissāya labhati samādhiṁ, labhati cittassa ekaggataṁ— ayaṁ vuccati chandasamādhi. So anuppannānaṁ pāpakānaṁ akusalānaṁ dhammānaṁ anuppādāya chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati. Uppannānaṁ pāpakānaṁ akusalānaṁ dhammānaṁ pahānāya chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati. Anuppannānaṁ kusalānaṁ dhammānaṁ uppādāya chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati. Uppannānaṁ kusalānaṁ dhammānaṁ ṭhitiyā asammosāya bhiyyobhāvāya vepullāya bhāvanāya pāripūriyā chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati. Ime vuccanti ‘padhānasaṅkhārā’ti. Iti ayañca chando, ayañca chandasamādhi, ime ca padhānasaṅkhārā— ayaṁ vuccati, bhikkhave, chandasamādhippadhānasaṅkhārasamannāgato iddhipādo.
Immersion Due to Enthusiasm
“Mendicants, if a mendicant depends on enthusiasm in order to gain immersion, gain unification of mind, this is called immersion due to enthusiasm. They generate enthusiasm, try, make an effort, exert the mind, and strive so that bad, unskillful qualities don’t arise. They generate enthusiasm, try, make an effort, exert the mind, and strive so that bad, unskillful qualities that have arisen are given up. They generate enthusiasm, try, make an effort, exert the mind, and strive so that skillful qualities arise. They generate enthusiasm, try, make an effort, exert the mind, and strive 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 enthusiasm, this immersion due to enthusiasm, and these active efforts. This is called the basis of psychic power that has immersion due to enthusiasm, and active effort.