MN 141 wrote:It’s when a mendicant generates
enthusiasm (chandaṁ), tries, makes an effort, exerts the mind, and strives
so that bad, unskillful qualities don’t arise.
Idhāvuso, bhikkhu anuppannānaṁ pāpakānaṁ akusalānaṁ dhammānaṁ anuppādāya
chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati,
They generate
enthusiasm (chandaṁ), try, make an effort, exert the mind, and strive
so that bad, unskillful qualities that have arisen are given up.
uppannānaṁ pāpakānaṁ akusalānaṁ dhammānaṁ pahānāya
chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati,
They generate
enthusiasm (chandaṁ), try, make an effort, exert the mind, and strive
so that skillful qualities arise.
anuppannānaṁ kusalānaṁ dhammānaṁ uppādāya
chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati,
They generate
enthusiasm (chandaṁ), try, make an effort, exert the mind, and strive s
o that skillful qualities that have arisen remain, are not lost, but increase, mature, and are completed by development.
uppannānaṁ kusalānaṁ dhammānaṁ ṭhitiyā asammosāya bhiyyobhāvāya vepullāya bhāvanāya pāripūriyā
chandaṁ janeti vāyamati vīriyaṁ ārabhati cittaṁ paggaṇhāti padahati,
This is called right effort.
https://suttacentral.net/mn141/en/sujato