Srila Prabhupada: Bhagavad-gita As It Is original edition Macmillan 1972
When one acts in Kṛṣṇa consciousness, he does not act as the master of the world. Just like a servant, one should act fully under the direction of the Supreme Lord. A servant has no individual independence. He acts only on the order of the master. A servant acting on behalf of the supreme master has no affection for profit and loss. He simply discharges his duty faithfully in terms of the order of the Lord. Now, one may argue that Arjuna was acting under the personal direction of Kṛṣṇa, but, when Kṛṣṇa is not present, how should one act? If one acts according to the direction of Kṛṣṇa in this book, as well as under the guidance of the representative of Kṛṣṇa, then the result will be the same. The Sanskrit word mat-paraḥ is very important in this verse. It indicates that one has no goal in life save and except acting in Kṛṣṇa consciousness just to satisfy Kṛṣṇa. And, while working in that way, one should think of Kṛṣṇa only: "I have been appointed to discharge this particular duty by Kṛṣṇa." While acting in such a way, one naturally has to think of Kṛṣṇa. This is perfect Kṛṣṇa consciousness. One should, however, note that, after doing something whimsically, he should not offer the result to the Supreme Lord. That sort of duty is not in the devotional service of Kṛṣṇa consciousness. One should act according to the order of Krṣna. This is a very important point. That order of Kṛṣṇa comes through disciplic succession from the bona fide spiritual master. Therefore the spiritual master's order should be taken as the prime duty of life. If one gets a bona fide spiritual master and acts according to his direction, then his perfection of life in Kṛṣṇa consciousness is guaranteed.
...Actually, anyone who hears Bhagavad-gītā from a bona fide spiritual master like Kṛṣṇa or His representative will find that all his ignorance is dispelled. Bhagavad-gītāis not an ordinary book written by a poet or fiction writer; it is spoken by the Supreme Personality of Godhead. Any person, if he is fortunate enough to hear these teachings from Kṛṣṇa or from His bona fide spiritual representative, is sure to become a liberated person and get out of the darkness of ignorance.
Vyāsa was the spiritual master of Sañjaya, and Sañjaya admits that it was by his mercy that he could understand the Supreme Personality of Godhead. This means that one has to understand Kṛṣṇa not directly but through the medium of the spiritual master. The spiritual master is the transparent medium, although it is true that the experience is direct. This is the mystery of the disciplic succession. When the spiritual master is bona fide, then one can hear Bhagavad-gītā directly, as Arjuna heard it. ...
If one acts according to the direction of Kṛṣṇa in this book, as well as under the guidance of the representative of Kṛṣṇa, then the result will be the same.
the ONLY ONE representative of Krsna in ISKCON: Srila Prabhupada
in this book: Srila Prabhupada: Bhagavad-gita As It Is original edition Macmillan 1972
Śrīla Prabhupāda’s original Bhagavad-gītā is available in different foreign translation:
DO NOT READ THE CHANGED BOOKS!