Those who know the day of Brahma, as being of one thousand ages, and a night of his, as being of one thousand ages (Yuga) know Day and Night.
सहस्रयुगपर्यन्तमहर्यद् ब्रह्मणो विदुः। रात्रिं युगसहस्रान्तां तेऽहोरात्रविदो जनाः॥