Kali-yuga’s Degradation, the Advent of Kalki, and the Reset of the Yuga Cycle
कृतं त्रेता द्वापरं च कलिश्चेति चतुर्युगम् । अनेन क्रमयोगेन भुवि प्राणिषु वर्तते ॥ ३९ ॥
kṛtaṁ tretā dvāparaṁ ca kaliś ceti catur-yugam anena krama-yogena bhuvi prāṇiṣu vartate
Der Zyklus der vier Zeitalter—Satya, Tretā, Dvāpara und Kali—setzt sich unter den Lebewesen auf Erden unaufhörlich fort und wiederholt stets dieselbe Abfolge.
It states that Kṛta (Satya), Tretā, Dvāpara, and Kali together make a four-yuga cycle, and these ages proceed in a fixed sequence, continually occurring on earth among living beings.
He is explaining the structure of time and the changing conditions of dharma across ages, giving Parīkṣit the broader context for understanding the nature of Kali-yuga and its effects.
It helps one recognize that social and moral conditions change with time, encouraging steadiness in dharma and greater reliance on sincere devotion (bhakti) rather than expecting perfection from the age.