So here Śrī Caitanya Mahāprabhu, He's also Kṛṣṇa. Śrī-kṛṣṇa-caitanya rādhā-kṛṣṇa nahe anya. He has appeared as devotee. He appeared first of all as the Supreme Lord, Kṛṣṇa, and He instructed Bhagavad-gītā to the fallen souls and He asserted His Lordship, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66). But puffed-up, so-called learned scholars and men of position, they declined, "Why should I surrender to Kṛṣṇa?" Therefore Kṛṣṇa Himself as devotee of Kṛṣṇa appeared. That is Śrī Caitanya Mahāprabhu. Caitanya Mahāprabhu is Kṛṣṇa Himself, but He's teaching how to approach Kṛṣṇa. And His disciples, they are also teaching the same philosophy. There is no difference between Kṛṣṇa's philosophy and Caitanya Mahāprabhu's philosophy. It is not that we can manufacture some philosophy. That is nonsense. Philosophy is one; religion is one. Everyone has to follow. There is no second alternative. That is the preaching about... Mām ekam, not that "Whatever you like, you can do." No, that is not. Mām ekam—simply Kṛṣṇa. There are some missionaries. They say that you can manufacture in your..., your own way of worship, and whatever you accept, that is all right. These bogus things are not accepted by the ācāryas. Mām ekam, Kṛṣṇa. Kṛṣṇas tu bhagavān svayam (SB 1.3.28). If you want to understand what is Bhagavān, that is Kṛṣṇa. Bhagavān... Religion means to understand Bhagavān. The other day we were consulting dictionary? Religion means the process by which we can understand the supreme controller. There is a supreme controller, as in every department, in every state, every affair, every business, every institution there is a controller. That you have got experience, practical. Without controller, nothing can be properly discharged. Controller is required.
So the śāstra says that controller or ruler is the same, and the Sanskrit synonym is īśvara. Īśvara means controller or ruler. So there are different kinds of controllers according to time, sphere. Just like in your country, the President is the controller. In other country somebody is controller. So there are many hundreds and thousands of planets within this universe, and each and every planet there is a controller. The sun planet, there is a controller. His name is Vivasvān. That we find. Similarly, the moon planet, there is a controller. Every planet, there is controller. And above all of them there is another supreme controller of the universe, the Brahma, and there are many millions of brahmāṇḍas, or universes. So there are controllers. But so far Kṛṣṇa is concerned, He is described in the śāstras, Brahma-saṁhitā, īśvaraḥ paramaḥ kṛṣṇaḥ (Bs. 5.1). There are controllers, but the supreme controller is Kṛṣṇa. Īśvaraḥ paramaḥ kṛṣṇaḥ. Īśvaraḥ means controller. Sac-cid-ānanda-vigrahaḥ (Bs. 5.1). His form... He has form. Bhagavān means with form. You see the form here, vigrahaḥ. Vigrahaḥ means form. But His form is different from our. He's sac-cid-ānanda. His form is eternal. Our, this form is not eternal. We have to give it up. We have to accept another form according to our karma. Tathā dehāntara-prāptiḥ (BG 2.13). But Kṛṣṇa hasn't got to do that. He is in His original form. He has got many forms, expansions, but His original form is Kṛṣṇa with two hands and flutes.