Bhagavad Gita · Chapter 4: Knowledge and the Renouncing of Action

Bhagavad Gita 4.4

aparaṃ bhavato janma paraṃ janma vivasvataḥ | kathametadvijānīyāṃ tvamādau proktavāniti ||

Your birth was later, and the birth of Vivasvan was earlier. How am I to understand that you taught this in the beginning?

Modern context

Arjuna hears a claim that does not add up and says so at once. Krishna was born recently and the sun god is ancient, so how could Krishna have been the teacher? This is how a good student behaves. He neither swallows the statement nor dismisses it. He states the difficulty plainly and asks. The Gita moves forward on such questions, and it never treats an honest question as disrespect.