Śrīmad-Bhāgavatam · Text 10.48.23
Who is speaking and story frame
त्वयोदितोऽयं जगतो हिताय
यदा यदा वेदपथ: पुराण: ।
बाध्येत पाषण्डपथैरसद्भि-
स्तदा भवान् सत्त्वगुणं बिभर्ति ॥ २३ ॥
tvayodito ’yaṁ jagato hitāya
yadā yadā veda-pathaḥ purāṇaḥ
bādhyeta pāṣaṇḍa-pathair asadbhis
tadā bhavān sattva-guṇaṁ bibharti
You originally enunciated the ancient religious path of the Vedas for the benefit of the whole universe. Whenever that path becomes obstructed by wicked persons following the path of atheism, You assume one of Your incarnations, which are all in the transcendental mode of goodness.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.
From 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.