Penance accomplished for purification of soul and shedding the Karma-pudgalas (material clusters qua Karma) through surmounting the Parīṣahas (hardships) (that occur in the ascetic life).
tapaḥparīṣahajayakṛtaḥ kūśalamūlaḥ.
(TaBhā 9.7)
pansahajaye krte kuśalamūlā, sā śubhānubandhā niranubandhā ceti.
(TaVā 9.45)