Guru means one who has taken full shelter, complete surrender to Kṛṣṇa, he is guru. Or he speaks only what is spoken by Kṛṣṇa. Just like we are speaking in this Bhagavad-gītā, as it is. There is no malinterpretation. Kṛṣṇa says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66); the guru will teach his disciple that, "You surrender to Kṛṣṇa." Kṛṣṇa is God, He is saying: "Surrender to Me," and guru is saying: "You surrender to Kṛṣṇa." Therefore the statement is the same. Kṛṣṇa says, man-manā bhava mad-bhakto mad-yājī māṁ namaskuru (BG 18.65), so guru will say the same thing that, "You always think of Kṛṣṇa, you become a devotee of Kṛṣṇa, you offer worship to Kṛṣṇa, you offer your obeisances." This is guru's business. Not that because in the śāstra it is said that guru should be honored as Kṛṣṇa, as Bhagavān, therefore guru will think, "I have become Bhagavān." No. That is Māyāvāda. The disciple will offer as respect . . . as much respect he offers to Kṛṣṇa, to guru. That is the śāstric injunction. For that reason the real guru will not think that, "I have become Kṛṣṇa." Kintu prabhor yaḥ priya eva tasya. Yasya prasādād bhagavat-prasādo. By the mercy of guru, you get the mercy of Kṛṣṇa. If . . . if guru approves, that "Here is a nice devotee," then Kṛṣṇa accepts, "Yes, here is a nice devotee."
So therefore yasya prasādād, our business is to please guru. If he is satisfied, then Kṛṣṇa immediately becomes satisfied, because he is the agent. That is very easy to understand. Suppose you are working in office. Your immediate boss, the superintendent, if he is pleased, that means the managing director is also pleased. You haven't got to please the managing director separately. If you please his representative, then the managing director sees the report, "Yes, this man is working nice." That he will accept. He has never seen him. But that is not the fact. Kṛṣṇa also seeing you.