Chapter VIII · Śloka 17
सहस्रयुगपर्यन्तमहर्यद्ब्रह्मणो विदुः ।
रात्रिं युगसहस्रान्तां तेऽहोरात्रविदो जनाः ॥
रात्रिं युगसहस्रान्तां तेऽहोरात्रविदो जनाः ॥
sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ |
rātriṃ yuga-sahasrāntāṃ te'ho-rātra-vido janāḥ ||
rātriṃ yuga-sahasrāntāṃ te'ho-rātra-vido janāḥ ||
Those who know day and night know that Brahmā's day spans a thousand yugas and his night also a thousand yugas.
Krishna introduces cosmic time-scales: one day of Brahmā equals 4.32 billion human years (a thousand mahāyugas), and the night is equally vast. This relativises all earthly achievement and underscores why even Brahmaloka does not represent final liberation.