The guru must be mahātmā and muni. Muni means thoughtful, philosopher. Not foolish rascal, manufacturing some philosophy. And mahātmabhiḥ: not only self-realized, but by his character, by his behavior, by his understanding, he must be a mahātmā. What is that mahātmā? There are so many mahātmās simply by changing the dress. No. Not that kind of mahātmā. Our Bhaktivinoda Ṭhākura has sung a song, eita eka kalir celā: "Here is a disciple of Kali." What is that? Nāke tilaka galai mālā. "He has got tilaka . . ." Nata nara nāke tilaka galai mālā. He sings that sahaja bhajana kache namu saṅge laiyā pare dala. Bhaktivinoda Ṭhākura sings that "He's dressed like a bābājī. He has shaven his head, and has got tilaka and kaṇṭhī. But he has got at least half a dozen women, and that is his bhajana." So not that . . . that is not mahātmā. That is durātmā, a cheating . . . of course, in this Kali-yuga . . . therefore Bhaktivinoda Ṭhākura says, eita eka kalir celā. Kalir celā means the disciple of Kali. Dressed like a sādhu or Vaiṣṇava, but within, all rubbish things. That will not help us. He must be mahātmā real mahātmā. We want guru like that. Then it will be a . . . we must be also qualified, and guru also qualified. Therefore it is said in the Hari-bhakti-vilāsa that one year should be taken to study one another, the guru and the disciple. The guru also will see whether the person is fit to become a disciple, and the disciple also will see, "Whether this gentleman can become my guru."
So the qualification of guru is, he should be mahātmā and muni. Muni means philosopher, and mahātmā means God-realized. Really mahātmā means God-realized. He knows.