Avaiṣṇavo gurur na syād vaiṣṇavaḥ śva-paco guruḥ (Padma Purāṇa). If a dog-eater, caṇḍāla, he has become a Vaiṣṇava, he can be guru. But a brāhmaṇa, ṣaṭ-karma-nipuṇo vipro mantra-tantra-viśāradaḥ, avaiṣṇavo gurur na syāt. If he's expert, Vedic chanting and everything, mantra-tantra-viśārada, but if he's not a Vaiṣṇava, he cannot become guru. So according to our Caitanya Mahāprabhu's . . . that is actually according to Vedic injunction. If you understand Kṛṣṇa, then you become more than a brāhmaṇa. Try to understand Kṛṣṇa, and then your life is successful. And Kṛṣṇa is being distributed by Lord Kṛṣṇa. Not only He's giving Kṛṣṇa, He's giving kṛṣṇa-prema, kṛṣṇa-prema-pradāya te kṛṣṇāya kṛṣṇa-caitanya-nāmne gaura-tviṣe namaḥ (CC Madhya 19.53). Caitanya Mahāprabhu is so kind, merciful, He's not only giving Kṛṣṇa, He's giving kṛṣṇa-prema, which is very, very rare.