BG 8.19

8.19 भूतग्रामः multitude of beings? सः that? एव verily? अयम् this? भूत्वा भूत्वा being born again and again? प्रलीयते dissolves? रात्र्यागमे at the coming of night? अवशः helpless? पार्थ O Partha? प्रभवति comes forth? अहरागमे at the coming of day.Commentary Avidya (ignorance)? Kama (desire) and Karma (action) are the three knots that bind the individual to Samsara. Desire is born of Avidya. Man exerts to attain and enjoy the objects of his desires. During this activity he favours some and injures others through the force of RagaDvesha (love and hatred or attraction and repulsion). Therefore he is caught in the wheel of Samsara or transmigration. He has to take birth again and again to reap the fruits of his own actions. He repeatedly comes forths and dissolves through the force of his own Karma.The individual souls have lost their independence as they are bound by ignorance? desire and activity. Therefore they are subject to the sorrows? miseries and pains of this Samsara. In order to create dispassion in their minds and a longing for liberation in their hearts? and to remove the fallacious belief 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? the Lord has said that all creatures involuntarily come into being again and again at the coming of the day and dissolve at the coming of the night (on account of the actions or Karmas caused by desire born of ignorance).

— vedicscriptures · exposition · source ↗

The less intelligent, who try to remain within this material world, may be elevated to higher planets and then again must come down to this planet earth. During the daytime of Brahmā they can exhibit their activities on higher and lower planets within this material world, but at the coming of Brahmā’s night they are all annihilated. In the day they receive various bodies for material activities, and at night they no longer have bodies but remain compact in the body of Viṣṇu. Then again they are manifest at the arrival of Brahmā’s day. Bhūtvā bhūtvā pralīyate: during the day they become manifest, and at night they are annihilated again. Ultimately, when Brahmā’s life is finished, they are all annihilated and remain unmanifest for millions and millions of years. And when Brahmā is born again in another millennium they are again manifest. In this way they are captivated by the spell of the material world. But those intelligent persons who take to Kṛṣṇa consciousness use the human life fully in the devotional service of the Lord, chanting Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. Thus they transfer themselves, even in this life, to the spiritual planet of Kṛṣṇa and become eternally blissful there, not being subject to such rebirths.

— vedicscriptures · exposition · source ↗