Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
सधर्माः सव्रताः सांगा यथाधर्मं युगेयुगे / विक्रियन्ते समानार्था वेदवादा यथायुगम्
sadharmāḥ savratāḥ sāṃgā yathādharmaṃ yugeyuge / vikriyante samānārthā vedavādā yathāyugam
The Vedic teachings—together with dharma, vows, and the Vedāṅgas—proceed age after age in accord with righteousness. Their meaning is one, yet their expression shifts with each yuga.