The root cause of the material manifestation described here is the Supreme Personality of Godhead. The Supreme Personality of Godhead expands Himself to take charge of the three qualities of the material world. Viṣṇu takes charge of the mode of goodness, Brahmā takes charge of the mode of passion, and Lord Śiva takes charge of the mode of ignorance. Brahmā, by the mode of passion, creates this manifestation, Lord Viṣṇu maintains this manifestation by the mode of goodness, and Lord Śiva annihilates it by the mode of ignorance. The whole creation ultimately rests in the Supreme Lord. He is the cause of creation, maintenance and dissolution. And when the whole manifestation is dissolved, in its subtle form as the Supreme Lord’s energy it rests within His body.
“At present,” the demigods prayed, “the Supreme Lord Kṛṣṇa is appearing just for the maintenance of this manifestation. Actually the Supreme Cause is one, but less intelligent persons, being deluded by the three modes of material nature, see that the material world is manifested through different causes. Those who are intelligent can see that the cause is one, Kṛṣṇa.” As it is stated in the Brahma-saṁhitā, īśvaraḥ paramaḥ krsnah . . . sarva-kāraṇa-kāraṇam (BS 5.1). “Kṛṣṇa, the Supreme Personality of Godhead, is the cause of all causes.” Brahmā is the deputed agent for creation, Viṣṇu is the expansion of Kṛṣṇa for maintenance, and Lord Śiva is the expansion of Kṛṣṇa for dissolution.
“Our dear Lord,” the demigods prayed, “it is very difficult to understand Your eternal form or personality. People in general are unable to understand Your actual form; therefore You are personally descending to exhibit Your original eternal form. Somehow people can understand the different incarnations of Your Lordship, but they are puzzled to understand the eternal form of Kṛṣṇa with two hands, moving among human beings exactly like one of them. This eternal form of Your Lordship gives ever-increasing transcendental pleasure to the devotees, but for the nondevotees this form is very dangerous.” As stated in the Bhagavad-gītā, Kṛṣṇa is very pleasing to the sādhus (paritrāṇāya sādhūnām) (BG 4.8). But this form is very dangerous for the demons because Kṛṣṇa also descends to kill the demons. He is, therefore, simultaneously pleasing to the devotees and dangerous to the demons.