SB 12.2.39
Devanāgarī
कृतं त्रेता द्वापरं च कलिश्चेति चतुर्युगम् । अनेन क्रमयोगेन भुवि प्राणिषु वर्तते ॥ ३९ ॥
Text
kṛtaṁ tretā dvāparaṁ ca kaliś ceti catur-yugam anena krama-yogena bhuvi prāṇiṣu vartate
Synonyms
kṛtam—Satya-yuga;tretā—Tretā-yuga;dvāparam—Dvāpara-yuga;ca—and;kaliḥ—Kali-yuga;ca—and;iti—thus;catuḥ-yugam—the cycle of four ages;anena—by this;krama—sequential;yogena—pattern;bhuvi—in this world;prāṇiṣu—among living beings;vartate—goes on continuously.
Translation
The cycle of four ages — Satya, Tretā, Dvāpara and Kali — continues perpetually among living beings on this earth, repeating the same general sequence of events.