How you can practice this yoga? This yoga system is that yogaṁ yuñjan mad-āśrayaḥ, and in the previous verse it is said that mad-gatena antar-ātmanā. If you keep Kṛṣṇa always within your heart in this way, mayy āsakta-manāḥ, the mind being. . . thus being attached, mayy āsakta, this is yoga. This yoga has to be practiced, how to keep Kṛṣṇa always within your heart. That is first-class yoga. Mayy āsakta-manāḥ pārtha. Yogam, this yogaṁ yuñjan mad-āśrayaḥ. And this yoga practice can be possible by the process mad-āśrayaḥ. Mad-āśrayaḥ means "one who has taken shelter of Me." Mat means "Me," and āśrayaḥ means to take shelter. That means devotee. Or mad-āśrayaḥ means one who has taken the shelter of a devotee. A devotee is also mad-āśrayaḥ. A devotee means who has taken shelter of the lotus feet of Kṛṣṇa completely. So either you. . . Of course, it is not possible to take the shelter of Kṛṣṇa directly. That is not possible. May be possible by Kṛṣṇa's special mercy, but general process is you have to go through the mercy or process of accepting a guru. Tad-vijñānārthaṁ sa gurum eva abhigacchet (MU 1.2.12). Guru. And who is guru? Yei kṛṣṇa-tattva-vettā sei guru haya (CC Madhya 8.128). There is no difficulty to find out. Sometimes they plead that "Whom I can accept as guru?" That is. . . Caitanya Mahāprabhu has cleared: ye kṛṣṇa-tattva-vettā sei guru haya. You haven't got any trouble to find out guru. Anyone who knows about Kṛṣṇa, he is guru.
So mad-āśrayaḥ means directly we cannot take shelter of Kṛṣṇa. Therefore, one who has taken shelter of Kṛṣṇa, one who knows the science of Kṛṣṇa, one who knows what is Kṛṣṇa—you take shelter of that person. Mad-āśrayaḥ. Taking shelter, ādau gurv-āśrayam, that is the process of this Kṛṣṇa consciousness movement. Ādau, in the beginning, you have to take shelter of guru. Ādau gurv-āśrayaṁ sad-dharma-pṛcchā: "Then you inquire from him about Kṛṣṇa." Sad-dharma-pṛcchā, sādhu-mārgānugamanam: "Then follow the footstep of big, big devotees." Just like Prahlāda Mahārāja, a great devotee; Kapiladeva, a great devotee; and similarly, Brahmā, a great devotee. Lord Śiva is great devotee; Nārada Muni, a great devotee. There are. . . Especially twelve names are given in the śāstras, that we have to follow them. That is called sampradāya. Sampradāya means coming in disciplic succession from the original guru. Just like Kṛṣṇa instructed Brahmā, so Brahmā is one of the gurus. So Brahma-sampradāya there is. Brahma-sampradāya. Our this Gauḍīya-sampradāya belongs to that Brahma-sampradāya. In this way there is Rāmānuja-sampradāya. This sampradāya comes from the goddess of fortune, Lakṣmījī, Śrī-sampradāya. In this way there are twelve mahājanas. They are stated in the śāstra. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186). We have to take the path of mahājana, and the purpose is how to increase your attachment for Kṛṣṇa. This is the business. And this business you can occupy yourself in this human form of life.