tvam ādau proktavān iti

arjunah uvaca-Arjuna said; aparam-junior; bhavatah-Your; janma-birth; param-superior; janma-birth; vivasvatah-of the sun-god; katham-how; etat-this; vijaniyam-shall I understand; tvam-You; adau-in the beginning; proktavan-instructed; iti-thus.