We have to know Kṛṣṇa as He is. So "know" means to hear about Him. Because Kṛṣṇa... We are not directly in contact with Him, Kṛṣṇa, in yoga. Kṛṣṇa-yoga means to know Kṛṣṇa, and then we become attached or make connection with Him. Sambandha. This is called sambandha. We must know what is our relationship with Kṛṣṇa. That relationship is described by Śrī Caitanya Mahāprabhu when He was inquired by Sanātana Gosvāmī, "So what is my position? What I am?" Śrī Caitanya Mahāprabhu said that every living entity is eternal servant of Kṛṣṇa.
This is our relationship. We are eternal servant of Kṛṣṇa. Therefore Kṛṣṇa is asking here: mayy āsakta. We are eternally related with Kṛṣṇa, but now, under the influence of this material energy or illusory, external energy, we have forgotten Kṛṣṇa. Therefore Kṛṣṇa says that "You have to divert your attention, attachment, to Me." Mayy āsakta. Mayi. Kṛṣṇa says mayi. Mayy āsakta. Mayy āsakta-manāḥ. Mind has to be always fixed up in Kṛṣṇa. This yoga has to be practiced. As Mahārāja Ambarīṣa did: sa vai manaḥ kṛṣṇa-padāravindayoḥ (SB 9.4.18). He always... He was a great emperor. He had many business, political and maintenance of the kingdom. He was always busy, great emperor of the whole world, but still he fixed up his mind always on the lotus feet of Kṛṣṇa. That is called kṛṣṇa-āsakti. Kṛṣṇa-āsakti. Mayi, mayy āsakta-manāḥ. Mind has to be fixed with Kṛṣṇa. The process is very simple. Process is very simple. Everyone, at home, in any condition of life, he can fix up his mind in Kṛṣṇa. Our mind has to be fixed in something, because mind is never vacant. It is always fixed up or attached to some, something. Not for a second our mind is vacant. So this vacancy has to be filled up by the presence of Kṛṣṇa. That is perfect yoga.