So īśvara, there are innumerable īśvara forms, as it is stated in the Brahma-saṁhitā. Advaitam acyutam anādim ananta-rūpam (Bs. 5.33). Many, many, many millions and trillions of īśvara form. It is stated in the Bhāgavatam that many. . . How many, how you can calculate? That is compared—just like in the river or in the ocean there are waves, but you cannot count how many waves are there. That is not possible. Can you count the waves of the ocean, going on, day and night, waves? Similarly, in big, big rivers. . . So God's incarnation, they are coming out, innumerable, just like the waves, but we can understand by the action that He is incarnation of God.
So the activities of Advaita Ācārya means that He's īśvara. He called Caitanya Mahāprabhu to come down. That is īśvara. You cannot call the Supreme Personality of Godhead to come down. That is not possible. But īśvara, or one who has attained the power of attorney from īśvara, he can do that. It is no otherwise possible. Otherwise, it is impossible. Kṛṣṇa-śakti vinā nahe nāma pracāra. We have to receive the authority from Kṛṣṇa. Then it is possible to preach the cult of Hare Kṛṣṇa movement. That means īśvara, and anyone who attains the power of attorney from īśvara, he's also īśvara. That is called power of attorney. He can act on behalf of the proprietor. That is possible.
So Advaita, Advaita Ācārya, did it. He inaugurated this Kṛṣṇa consciousness movement. When He saw that the people are so much misled that simply they are busy for the bodily necessities of life and completely have forgotten Kṛṣṇa, He became sympathetic. That is Vaiṣṇava behavior. Vaiṣṇavas, they are the best friend of the society, best friend, Vaiṣṇava. Patitānāṁ pāvanebhyo vaiṣṇavebhyo namo namaḥ. The Vaiṣṇava is always thinking how to deliver these fallen souls who are so much captivated with this false philosophy of hedonism—"Eat, drink, be merry and enjoy." This is called hedonism. So they are always thinking how to deliver them. Advaita Prabhu did it; therefore He is īśvara. Prahlāda Mahārāja did it. Any Vaiṣṇava who is actually feeling for the poor conditioned souls, he must make arrangement for delivering these rascals from the death knell of ignorance.