So Kṛṣṇa is bhava-sambhava-lopa-hetoḥ. Everything which is going on—creation, maintenance, and also annihilation—the original cause is Kṛṣṇa. When there is need of creation, the cause is Kṛṣṇa. When there is need of maintenance, the cause is Kṛṣṇa. Everything, the cause is Kṛṣṇa. And there is annihilation—the cause is Kṛṣṇa. So sṛṣṭi-sthiti-pralaya, although it is being done... Sṛṣṭi means creation; sthiti means maintenance; pralaya means destruction. These things are going on in the material world. Everything is created. Just like your body, my body, it is created at a certain date.
There is history. And it will maintain, say, utmost, for fifty, sixty or hundred years. It will never be eternal. Because it is created, it cannot be eternal. Anything created cannot be eternal. So this sṛṣṭi-sthiti-pralaya-sādhana is actually being done by Kṛṣṇa, whatever way. But because we cannot see Kṛṣṇa in the background, we see only the wonderful activities of the nature. Nature is working not independently—by the direction of Kṛṣṇa. Mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram [Bg. 9.10]. Whatever is going on by the wonderful activities of nature... People are amazed by seeing the wonderful activities of nature. But behind these activities there is the direction of the Supreme Personality.
Srila Prabhupada's lecture - Śrīmad-Bhāgavatam 7.9.42 - Māyāpur, March 22, 1976