यदा यदा वेदपथ: पुराण: ।
स्तदा भवान् सत्त्वगुणं बिभर्ति ॥ २३ ॥
yadā yadā veda-pathaḥ purāṇaḥ
bādhyeta pāṣaṇḍa-pathair asadbhis
tadā bhavān sattva-guṇaṁ bibharti
tvayā — by You; uditaḥ — enunciated; ayam — this; jagataḥ — of the universe; hitāya — for the benefit; yadā yadā — whenever; veda — of the Vedic scriptures; pathaḥ — the path (of religiousness); purāṇaḥ — ancient; bādhyeta — is obstructed; pāṣaṇḍa — of atheism; pathaiḥ — by those who follow the path; asadbhiḥ — wicked persons; tadā — at that time; bhavān — You; sattva-guṇam — the pure mode of goodness; bibharti — assume.
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.