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Bhagavad-gñtā  As It Is
[Ch. 4]
Commentation by the devotees is real, whereas that of the demons is useless. Arjuna accepts Śrī Kṛṣṇa as the Supreme Personality of Godhead, and any commentary on the  Gītā  following in the footsteps of Arjuna is real devotional service to the cause of this great science. The demonic, however, concoct something about Kṛṣṇa and mislead the public and general readers from the path of Kṛṣṇa's instructions. One should try to follow the disciplic succession from Arjuna, and thus be benefitted.
TEXT 4
अर्जुन उवाच । 
    अपरं भवतो जन्म परं जन्म विवस्वतः । 
    कथमेतद्विजानीयां त्वमादौ ग्रोक्तवानिति ॥४॥
arjuna uvāca  
 aparaṁ bhavato janma  
 paraṁ janma vivasvataḥ  
 katham etad vijānīyāṁ  
 tvam ādau proktavān iti
arjunaḥ   uvāca —Arjuna said;  aparam —junior;  bhavataḥ —Your;  janma —birth;  param —superior;  janma —birth;  vivasvataḥ —of the sun-god;  katham —how;  etat —this;  vijānīyām —shall I understand;  tvam —You;  ādau —in the beginning;  proktavān —instructed;  iti —thus.
TRANSLATION
Arjuna said: The sun-god Vivasvān is senior by birth to You. How am I to understand that in the beginning You instructed this science to him?
PURPORT
Arjuna is an accepted devotee of the Lord, so how could he not believe Kṛṣṇa’s words? The fact is that Arjuna is not inquiring for himself but for those who do not believe in the Supreme Personality of Godhead or for the demons who do not like the idea that Kṛṣṇa should be accepted as the Supreme Personality of Godhead; for them only Arjuna inquires on this point, as if he were himself not aware of the Personality of Godhead, or Kṛṣṇa. As it will be evident from the Tenth Chapter, Arjuna knew perfectly well that Kṛṣṇa is the Supreme