Bhagavad Gita Chapter 18, Verse 72
कच्चिदेतच्छ्रुतं पार्थ त्वयैकाग्रचित्तेन | कच्चिदज्ञानसंमोहः प्रणष्टस्ते धनंजय ||
kaccid etac chṛutaṁ pārtha tvayāikāgra-cittena kaccid ajñāna-saṁmohaḥ praṇaṣṭas te dhanaṁjaya
O Partha, has this been heard by you with one-pointed mind? And has your delusion of ignorance been destroyed, O Dhananjaya?
Krishna asks Arjuna if he has understood. 'Kaccid etac chṛutaṁ pārtha tvayāikāgra-cittena'—whether (kaccit) this (etat) has been heard (śrutam) by you (tvayā), O Partha (pārtha), with one-pointed mind (ekāgra-cittena)? 'Kaccid ajñāna-saṁmohaḥ praṇaṣṭas te dhanaṁjaya'—and whether (kaccit) the delusion of ignorance (ajñāna-saṁmohaḥ) has been destroyed (praṇaṣṭaḥ), O Dhananjaya (dhanaṁjaya), your (te)? This is Krishna's question to Arjuna: have you heard this teaching with focused attention, and has your delusion been destroyed? This is a check on understanding—Krishna wants to know if Arjuna has truly understood and if his confusion has been cleared. This reveals the importance of focused listening and the removal of delusion.