So if you actually want to execute tapasya, then you must approach a person who has already executed tapasya, tapo divyam (SB 5.5.1). Then you'll get the things. Mahat-sevām. And there you have to render your service. In humbleness, service, sevayā. You can question mahātmā not by challenging but surrounded by praṇipāt and sevā. Otherwise, you have no right to question. Just like this man went to Rūpa Gosvāmī. He has no right to waste time.
So actually this discussion, instructions, are to be executed amongst the guru and the disciples, where there is submission. Otherwise there is no need of. Nowadays we hold some meeting. Some ordinary people, they come to hear. But that kind of discussion Caitanya Mahāprabhu never did. Never did. Because these outsiders, they are not submissive. They come to see the fun. They do not come to learn something. Therefore Caitanya Mahāprabhu never made any big meeting. In big meeting He was present, but kīrtana, saṅkīrtana. He was meeting in big meeting daily in the evening for four hours in Jagannātha temple, but the whole period of time was engaged in chanting Hare Kṛṣṇa. But when there was a person like Sarvabhauma Bhaṭṭācārya or Prakāśānanda Sarasvatī or Rāmānanda Rāya, like such exalted person, He used to discuss. Otherwise, He was not discussing. There was no need of discussing, because they do not approach with that humbleness. They think... Just like Kṛṣṇa and Arjuna. So long Arjuna was thinking that "Kṛṣṇa is my friend. I shall reply Him equally," then Kṛṣṇa was very gravely speaking. But when Arjuna understood that "This kind of talking there will be no benefit," then he became His disciple: śiṣyas te 'ham śādhi māṁ prapannam (BG 2.7). "There is no more discussion. Now I accept You as my guru."
Guru means whatever instruction he'll give, we have to accept without any argument. Vedic knowledge is like that. You cannot interpret. As it is, you have to accept. Similarly guru's word also you have to accept. No argument. That is Vedic knowledge. That is the Vedic system. This example we have given many times: Just like this cow dung. Cow dung is the stool of an animal. So the stool of an animal is most impure thing. As soon as you touch, even your own stool... You may be very learned scholar or devotee, but that does not meant you can touch your own stool and remain purified. No. Immediately you have to take bath. Even his own, what to speak of others'. But in the Vedic instruction we see that the cow dung, it is the stool of an animal also, lower animal than the man, and it is pure, it is said. So you have to accept pure. No argument that "Such stool is impure. Even my spiritual master's stool is also impure. How is that that animal cow dung is pure?" But because it is in the Vedas it is said pure, you have to accept. Similarly, the conchshell, it is the bone of an animal. The bone, if you touch any dead body's bone, you'll have to take, immediately, purify. But that, this bone is placed in the Deity room. We are daily blowing the conchshell—because the Vedic instruction. So there is no argument. If you accept Vedic instruction, you have to accept it as it is.