Krishna eternally appears to protect devotees and destroy ignorance, while we suffer by falsely imitating the enjoyer rather than serving Him.Listen — Srila Prabhupada Uvaca
Bhagavad-gītā 4.8 — March 28, 1974, Bombay 740328BG-BOMBAY [41:06 Minutes] Bg-04.08_740328BG-BOMBAY Nitai: Oṁ namo bhagavate vāsudevāya. Oṁ namo bhagavate vāsudevāya. Oṁ namo bhagavate vāsudevāya. [Prabhupāda and devotees repeat] [leads chanting of verse] paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām dharma-saṁsthāpanārthāya sambhavāmi yuge yuge [Bg. 4.8] [break] [02:38] Translation: "In order to deliver the pious and to annihilate the miscreants, as well as to reestablish the principles of religion, I advent Myself millennium after millennium." Prabhupāda: paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām dharma-saṁsthāpanārthāya sambhavāmi yuge yuge [Bg. 4.8] So, the routine work of Kṛṣṇa, the Supreme Personality of Godhead, how and when He appears.
Because Kṛṣṇa is the proprietor of all planets. Bhoktāraṁ yajña-tapasāṁ sarva-loka-maheśvaram [Bg. 5.29]. Sarva-loka. Loka means planets or universes.
There are innumerable universes, unlimited number. And those universes are coming out within the breathing period of Mahā-Viṣṇu. Yasyaika-niśvasita-kālam athāvalambya jīvanti loma-vilajā jagad-aṇḍa-nāthāḥ [Bs. 5.48]. Jagad-aṇḍa means universe.
Jagad-aṇḍa-nātḥāḥ, plural number. There are innumerable universes, and on each universe there is a predominating deity who is called Lord Brahmā. Similarly, in each and every universe there are innumerable planets. Yasya prabhā prabhavato jagad-aṇḍa-koṭi-koṭiṣv aśeṣa-vasudhādi-vibhūti-bhinnam [Bs. 5.40].
In each universe there are innumerable planets, and each planet is of different atmosphere. The atmosphere of one planet is not equal to the another. This is God's creation. Ekāṁśena sthito jagat.
All these innumerable universes, they are sustained by one plenary portion of Kṛṣṇa. Kṛṣṇa, in His vibhūti-yoga, He has explained to Arjuna, athavā bahunaitena kiṁ jñātena tavārjuna viṣṭabhyāham idaṁ kṛtsnam ekāṁśena sthito jagat [Bg. 10.42] So Kṛṣṇa is staying within these universes. Aṇḍāntara-stha-paramāṇu-cayāntara-stham [Bs. 5.35]. Not only within the universes, but within the atom also. Paramāṇu-cayāntara-stham.
In this way, Kṛṣṇa is ruling over the material creation. Eko 'py asau racayituṁ jagad-aṇḍa-koṭi [Bs. 5.35]. There are many places in Vedic literature wherein we understand there are innumerable universes. We cannot take account of one universe, and Kṛṣṇa has to take account of all these universes, how things are going on.