Śrīmad-Bhāgavatam · Text 11.21.2
Who is speaking and story frame
स्वे स्वेऽधिकारे या निष्ठा स गुण: परिकीर्तित: ।
विपर्ययस्तु दोष: स्यादुभयोरेष निश्चय: ॥ २ ॥
sve sve ’dhikāre yā niṣṭhā
sa guṇaḥ parikīrtitaḥ
viparyayas tu doṣaḥ syād
ubhayor eṣa niścayaḥ
Steadiness in one’s own position is declared to be actual piety, whereas deviation from one’s position is considered impiety. In this way the two are definitely ascertained.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.