There are so many things to understand the science of Kṛṣṇa. Therefore Kṛṣṇa says that yatatām api siddhānāṁ kaścid vetti māṁ tattvataḥ (BG 7.3). There are many siddhas. We are not siddhas. We are trying to be siddhas. Manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye (BG 7.3). Not all. Just like here the bhakti-yoga is going on, how to become siddha. But who is interested? In Bombay there are millions of people, but who is interested? Therefore Kṛṣṇa says, manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye: "There are millions and millions of human being, but out of them, one may be interested to become siddha." And if one is siddha . . . yatatām api siddhānām. And all those siddhas, those who are actually siddhas, they are trying to understand Kṛṣṇa, kaścit, out of . . . some. Out of them, somebody may be knowing Kṛṣṇa.
Therefore the Kṛṣṇa science is not so easy. It is not so easy. So therefore Caitanya Mahāprabhu has advised, yei kṛṣṇa-tattva-vettā sei guru haya. Yei kṛṣṇa-tattva-vettā. Any person who knows the science of Kṛṣṇa, he is guru; not others. Yei kṛṣṇa-tattva-vettā, sei guru haya.
- kibā śūdra kibā vipra, nyāsī kene naya
- yei kṛṣṇa-tattva-vettā sei 'guru' haya
- (CC Madhya 8.128)
When Caitanya Mahāprabhu and Rāmānanda Rāya was talking about spiritual realization, so . . . Rāmānanda Rāya was from a śūdra family, and he was householder and governor of Madras, politician also. So Caitanya Mahāprabhu was asking question from him and . . . this is Caitanya Mahāprabhu's līlā, mūkaṁ karoti vācālam (CC Madhya 17.80), how He is making a śūdra, gṛhastha, politician His guru, Caitanya Mahāprabhu's guru. So nobody can become Caitanya Mahāprabhu's guru, but he was playing the part. He was questioning, and Rāmānanda Rāya was replying. So just imagine how his position was exalted. So he was little hesitating, and when very intricate questions were put before him . . . he was quite able to answer. He was answering. So he was feeling little hesitation, "Sir, You are coming out of a very high brāhmaṇa family, and the most learned personality, and now You have taken sannyāsa, the supermost position in the human society."