Revatīnandana: "A transcendentalist should always try to concentrate his mind on the Supreme Self. He should live alone in a secluded place and should always carefully control his mind. He should be free from desires and possessiveness."
Prabhupāda: Yes. This is the beginning of transcendental life. This chapter, Lord Kṛṣṇa will try to teach the principles of yoga system. So here He begins, that a transcendentalist should always try to concentrate his mind on the Supreme Self. Supreme Self means Kṛṣṇa, or Lord. He is the Supreme Self, as I just explained, nityo nityānāṁ cetanaś cetanānām (Kaṭha Upaniṣad 2.2.13).
He is the supreme eternal. He is the supreme living entity. So the whole yoga system is to concentrate mind on the Supreme Self.
We are not Supreme Self. That you can understand. Supreme Self is God. This is dvaita-vāda, duality. Duality means God is different from me. He is supreme; I am subordinate. He is great; I am small. He is infinite, I am infinitesimal. This is the relationship. So because we are infinitesimal, we should concentrate our mind to the infinite, Supreme Self.
Then, he should live alone. Alone. This is most important thing. Alone means not to live with persons who are not Kṛṣṇa conscious, or God conscious. That is alone. He should live alone in a secluded place. Secluded place, there are . . . or in the jungle, in the forest. It is very secluded place. But in this age it is very difficult to go to the jungle and find out a secluded place. The secluded place is that where simply God consciousness is taught. That is secluded place. That is secluded place.
Then? "And should always carefully control his mind." How to control the mind? Just fix up your mind to the Supreme Self, or Kṛṣṇa. Not anything else. Sa vai manaḥ kṛṣṇa-padāravindayoḥ (SB 9.4.18).