Sahasrayugaparyantam aharyad brahmano viduh;
Raatrim yugasahasraantaam te’horaatravido janaah.
17. Those 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.
Avyaktaadvyaktayah sarvaah prabhavantyaharaagame;
Raatryaagame praleeyante tatraivaavyaktasamjnake.
18. From the unmanifested all the manifested (worlds) proceed at the coming of the “day”;
at the coming of the “night” they dissolve verily into that alone which is called the unmanifested.
