Bhagavad Gita · Chapter 18: Freedom through Renunciation

Bhagavad Gita 18.72

kaccidetacchrutaṃ pārtha tvayaikāgreṇa cetasā | kaccidajñānasaṃmohaḥ pranaṣṭaste dhanañjaya ||

Have you listened to this, Arjuna, with your whole attention? Has your delusion, which was born of ignorance, been destroyed?

Modern context

Krishna asks a teacher's question: did you really listen? Has your confusion gone? After eighteen chapters, he checks whether the teaching has landed. Good teaching always ends this way: not 'I have told you', but 'do you understand?' The question is put to every reader too.