Kṛṣṇa is situated within our heart, Paramātmā, in His Paramātmā feature. Brahmeti paramatmeti bhagavān iti śabdyate (SB 1.2.11). So the feature by which Kṛṣṇa is situated in everyone's heart, that is . . . Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati (BG 18.61). So yogīs, they find out Kṛṣṇa. Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Yogīs try to find out the Paramātmā, and the jñānīs, they are trying to find out the brahma-jyotir, and similarly, the bhakta is trying to find out Kṛṣṇa. Brahmeti paramātmeti bhagavān iti śabdyate.
So in this way Bhagavān, the Supreme Personality of Godhead, is the ultimate goal. But those who are addicted to Brahman or Paramātmā, they are also addicted to Bhagavān, but in different features. Vadanti tat tattva-vidas tattvaṁ yaj jñānam advayam (SB 1.2.11). Knowledge of Brahman, knowledge of Paramātmā and knowledge of Kṛṣṇa is the same, but in different features. Just like knowledge of the sun planet, knowledge of the sun-god and knowledge of the sunshine, they . . . knowledge is the same—heat and light—but the heat and light which you receive from sunshine is different from the heat and light from the sun globe, and the heat and light in the sun globe is different from the sun god. But heat and light is there, either you realize Brahman, Paramātmā or Bhagavān. So a devotee means he is concerned with Bhagavān, that's all. So devotee is also mahātmā; those who are jñānīs, after Brahman, they are also mahātmā; and the yogīs, they are also mahātmā; but one who has understood Kṛṣṇa perfectly and surrendered to Him—vāsudevaḥ sarvam iti sa mahātmā su-durlabhaḥ (BG 7.19)—that mahātmā is very rare to be found.
So Caitanya Mahāprabhu is teaching how to become that mahātmā, su-durlabhaḥ. Koṭiṣv apy mahāmune. Muktānām api sahasrāṇām. Therefore Caitanya Mahāprabhu's teaching is so sublime, and very easy also. We should take it up—this is Kṛṣṇa consciousness movement—and execute it as it is enjoined in the śāstras and following the footsteps of mahājana. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186). That is also described in the śāstra. Svayambhūr nāradaḥ śambhuḥ kapilaḥ (SB 6.3.20). And . . . dvādaśa mahājana. Svayambhūr nāradaḥ śambhuḥ, and prahlādo janako bhīṣmo balir vaiyāsakir vayam. Everything is there in the śāstra. So to become actually devotee we have to follow these mahājana. Svayambhū is Brahmā, and . . . Svayambhūr . . . Nārada Muni, and Śambhu, Lord Śiva. They have got their parties, or their paramparā system—Brahmā-sampradāya, Rudra-sampradāya Śrī-sampradāya and Kumāra-sampradāya. In this way we have to accept the sampradāya and follow. Evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ (BG 4.2). Then we become pure devotee.