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Those people who know the day of Brahma which is of a duration of a thousand Yugas (ages) and the night which is also of a thousand Yugas duration, they know day and night.

Those who know that a day of Brahma lasts a thousand ages and that his night ends after a thousand ages are people who truly know day and night.

Krishna now speaks of cosmic time. A single day of Brahma lasts a thousand ages, yugas, and his night also ends after a thousand ages. Those who understand this truly know what day and night mean. The scale is immense, and it relativizes ordinary human time. Even the life of the creator is measured in days and nights that come and go. The verse places human concerns, including Arjuna's battle, against a background of vast and recurring cycles.