रात्र्यागमे प्रलीयन्ते तत्रैवाव्यक्तसंज्ञके ॥ १८ ॥
avyaktādvyaktayaḥ sarvāḥ prabhavantyaharāgame .
rātryāgame pralīyante tatraivāvyaktasaṃjñake .. 18 ..
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The Unmanifested (Avyakta) is the sleeping condition of the Prajāpati who is asleep. Out of That, all manifestations (vyaktis), all creatures unmoving and moving (sthavara and jangama), are manifested at the coming on of day, i.e., when Brahmā awakes. So, at the coming on of night, i.e., when Brahma goes to sleep, all the manifestations dissolve there only, in what is called Avyakta, the one already spoken of.
With a view to avoid the fallacious implication that a man reaps the fruits of what he has not done, or that he does not reap the fruits of what he has done, with a view to show that the teaching of the scripture concerning bondage (bandha) and liberation (moksha) has a purpose to serve, and with a view further to teach detachment from samsara by showing that, as the effect of karma caused by avidya (nescience) and other sources of evil, all creatures involuntarily come into being again and again and dissolve, the Lord says :