Karandhara: "The Īśopaniṣad is a part of the Yajur Veda, and as such, it contains information as to the proprietorship of all things that exist within the universe."
Prabhupāda: Just like evidence. Evidence... (aside:) Now you can sit down. Evidence, whenever we want to give evidence... Just like in law court, the evidence, you have to cite the section or the preamble of the laws. Similarly, in our human civilization this evidence is Vedas. If you find something stated in the Vedas, that you have to accept. That's all. Axiomatic truth. And because the Vedas were particularly studied by the brāhmaṇas, high-class qualified brāhmaṇas, therefore they are also accepted as authority. Just like Caitanya Mahāprabhu, when He was at Purī, the king of that place, Mahārāja Pratāparudra, he inquired from Sārvabhauma Bhaṭṭācārya, "Oh, what is your opinion about this Caitanya who has come here?" He said that "He is the Supreme Personality of Godhead." So the king immediately accepted it. King said, "Oh, He is Supreme Personality of Godhead?" So he accepted immediately, just like... There is no question of experimenting. Because an authority like Sārvabhauma Bhaṭṭācārya is stating, a brāhmaṇa and... He was very learned scholar. You know Sārvabhauma Bhaṭṭācārya's name. So because he said that "He is Supreme Personality..." He did not ask any storekeeper, but he asked a learned brāhmaṇa who knows things. So similarly, we have to accept in that way. In each and every case, if we want to research, it is not possible, because our senses are blunt senses. What you can do? Acintyāḥ khalu ye bhāvā na tāṁs tarkeṇa yojayet. The śāstra says that "Things which are beyond your conception, beyond your mental speculation"—avāṅ-manasā gocaraḥ—"neither you can express by words, neither you can think of." Avāṅ-manasā gocaraḥ.
So such things it is useless, try to understand by arguments. That is simply nonsense. You can, of course, inquire, but that inquiry is not challenge. If you inquire from your spiritual master by challenge, then it is your misfortune. You have to inquire from the spiritual master—that is indicated-sevayā, by service, by making him satisfied. Tad viddhi praṇipātena paripraśnena sevayā (BG 4.34). First of all you have to surrender, and then you have to please him by service. Yasya prasādād bhagavat-prasādaḥ **. If you can please him, then naturally Kṛṣṇa is pleased upon you. That is the injunction. So this praśna... First of all you should find out somebody where you can surrender. If there is duplicity in surrender, that is useless. First of all see whether you can surrender there; then accept him spiritual master and then please him by your service and inquiry. That is Vedic principle.