Kṛṣṇa says that mayy āsakta-manāḥ pārtha: "My dear Arjuna . . ." Arjuna is addressed here as "Pārtha," very familial. Because Pārtha, Kṛṣṇa . . . Arjuna's mother's name was Pṛthā, Kuntī's name. So . . . and Pṛthā, Kuntī, happened to be the aunt of Kṛṣṇa. So He's very feelingly, in a familial way, He's addressing, "Pārtha." "My dear Arjuna, Pārtha," mayy āsakta-manāḥ, "simply by increasing attachment for Me," mayy āsakta, mayy āsakta-manāḥ pārtha yogam . . . this is yoga. This is perfect yoga. Yoginām api sarve . . . mad-āśrayaḥ. "This yoga system should be executed directly under My direction, or under the direction of a representative of Mine."
The spiritual master is the representative of Kṛṣṇa. How he becomes representative? What is the test? The test is . . . just like anyone can understand, representative. Suppose a business firm's representative is going to canvass for business, what is his business? He will take the interest of the firm, not his personal interest. He will try to secure business for the firm he's working, not for his personal . . . that is perfect representative. And if he goes, in the name of the firm's representative, and he does his own business, then he's a liar.
Similarly, Kṛṣṇa's representative means one who speaks about Kṛṣṇa as Kṛṣṇa speaks. And if he adulterates, he's a liar; he's not representative. He's not representative. Kṛṣṇa says, man-manā bhava mad-bhakto mad-yājī māṁ namaskuru (BG 18.65), and if the representative says: "Just become a devotee of Kṛṣṇa. Just worship Kṛṣṇa. Just offer your obeisances to Kṛṣṇa," he is representative.
Kṛṣṇa says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66), and the representative will say that, "You give up all other process. You simply surrender to Kṛṣṇa." He will never say that, "I am Kṛṣṇa." He'll never say. He's not representative of Kṛṣṇa. He's a liar. He's not representative.
So to become representative of Kṛṣṇa is not very difficult. Simply one has to become very sincere. That's all. That whatever Kṛṣṇa says, he will say. Just like Arjuna accepted: sarvam etad ṛtaṁ manye yad vadasi keśava (BG 10.14). That is representative. "My dear Keśava, Kṛṣṇa, whatever You are speaking, I accept them all, in toto, without any reformation." That is representative of Kṛṣṇa.