The Brahma-saṁhitā says that advaita acyuta. Advaita means although Kṛṣṇa has many forms, many expansions, still, they are one. There is no duality. Just like Kṛṣṇa and Rāma, They are one. They are not different. Similarly, rāmādi-mūrtiṣu kalā-niyamena tiṣṭhan (Bs. 5.39). Beginning from Rāma, Nṛsiṁha, Varāha, He has got innumerable forms. Tiṣṭhan: He is existing always with all these forms, expansions, rāmādi-mūrtiṣu kalā.
Just like Kṛṣṇa existing in everyone's heart. There are millions and trillions of living entities. Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe arjuna tiṣṭhati (BG 18.61). Kṛṣṇa is existing. That is Kṛṣṇa's omnipotency. If you do not try to understand God, or Kṛṣṇa, with inconceivable omnipotency, then you cannot understand God. That is not possible.
So Kṛṣṇa . . . just like we are sitting here; we are not sitting in the other room. But Kṛṣṇa can sit in innumerable rooms simultaneously at one time. Therefore He is all-pervading. Just like Kṛṣṇa married 16,108 wives. Nārada came to see Kṛṣṇa, and every palace he entered he saw Kṛṣṇa was there. And with some wife, in some wife's palace He is playing with children, or some wife's He's just taking bath. Or in another palace He was playing chess. In this way he differently saw Kṛṣṇa in different palaces. So in 16,000 palaces he saw Kṛṣṇa.
That is Kṛṣṇa. Not that He married 16,000 wives but He remained one. He also expanded Himself sixteen hundred times. That is Kṛṣṇa. He can expand Himself. Rāsa-līlā . . . rāsa-līlā, every gopī was feeling that "Kṛṣṇa is dancing with me." So many gopīs. That is Kṛṣṇa. He can expand. But He has got form. He is not formless. The Māyāvādī philosopher thinks because Kṛṣṇa is all-pervading, therefore He has no form. No. That is not fact. He has form, but His form is not like your form and my form.
This form is explained in the Brahma-saṁhitā: advaitam acyutam anādim ananta-rūpam (Bs. 5.33). Acyuta. And He does not fall down. Acyuta means thing which does not fall down. So just like we are, we are living entities, we fall down in the clutches of māyā. But Kṛṣṇa does not fall down. The Māyāvādī philosophers mistake that. They think that as we come to this material world with a material body, similarly, Kṛṣṇa also comes with a material body. No. That is not the fact. Therefore Kṛṣṇa says, avajānanti māṁ mūḍhā manuṣīṁ tanum āśritāḥ (BG 9.11). Mūḍha. Mūḍha means those who are not intelligent: "They think that I am also ordinary man."