(Click to enlarge photo of Srila Prabhupada, Toronto, 1976)
"When Kṛṣṇa began His instruction and Arjuna was lamenting on the basis of this body: 'If we kill our brothers, their wives will be widowed and they'll be bhraṣṭācāra, the varṇa-saṅkara will be there.' Everything he was calculating on the basis of this body. All politics, sociology, they are going on the basis of this body. But Kṛṣṇa, as soon as He was accepted by Arjuna as guru... Śiṣyas te 'haṁ śādhi māṁ prapannam (BG 2.7): 'Now, Kṛṣṇa, I accept You as my guru. Not as friend.' Because friendly talking is useless waste of time. He accepted Him as guru. When guru speaks, you cannot argue. That is not the process. You should accept a guru who is infallible. Otherwise it is useless. He accepted guru Kṛṣṇa because Kṛṣṇa is infallible. If we accept guru, a bogus guru, then it is no benefit. Guru means Kṛṣṇa's representative. Guru, not that everyone can be guru."
(Srila Prabhupada Lecture, Vrindavan, October 3, 1976)