Guest: In Adhyāya Two of Śrīmad Bhagavad-gītā Kṛṣṇa, in one place He has told that karmaṇy evādhikāras te mā phaleṣu kadācana (BG 2.47).
Prabhupāda: Huh? Ma phaleṣu kadācana. But don't take the result.
Guest: He has ordered for duty, "You must do whatever you are doing."
Prabhupāda: Yes. So that duty should be performed. Nobody . . . just like Arjuna. Arjuna did his duty. He was a fighter, but he fought for Kṛṣṇa. That is his excellence. Is it not? He was a fighter. His duty as a kṣatriya, his duty is to fight. But he fought for Kṛṣṇa. Similarly, everyone can perform his duty. That is also enjoined in the Śrīmad-Bhāgavatam.
Ataḥ pumbhir dvija-śreṣṭhā varṇāśrama-vibhāgaśaḥ (SB 1.2.13). Varṇa and āśrama. There are different kinds of duties. Ataḥ pumbhir dvija-śreṣṭha varṇāśrama-vibhāgaśaḥ, svanuṣṭhitasya dharmasya. Everyone has got his particular type of duty, but how he is becoming perfect by performing his duty, that is to be seen whether Kṛṣṇa is satisfied. Svanuṣṭhitasya dharmasya saṁsiddhir hari-toṣaṇam.
Guest: How it can be judged that . . .
Prabhupāda: That by . . . through Kṛṣṇa's representative. He should certify, "Yes. Your duty is nicely performed."
Guest: How he may perfectly judge it? How the person will judge himself that I am doing . . .?
Prabhupāda: No. He'll not judge. His spiritual master will judge—Kṛṣṇa's representative. He'll not judge. He will make mistake. Therefore, if one has accepted a bona fide spiritual master, that means he is in direct touch with Kṛṣṇa. Transparent media. He has to see Kṛṣṇa through the transparent medium of spiritual master.
Therefore it is imperative, one has to accept a spi . . . tasmād guruṁ prapadyeta jijñāsuḥ śreyaḥ uttamam (SB 11.3.21). And what kind of guru? Śabde pare ca niṣṇataṁ brahmaṇy upāśamāśrayam. So this is a big science. One has to study. One has to understand. The things are there. There is no difficulty.