jñatva jñati-vadham garhyam
tato nivrtto hantaham
hato ’yam iti laukikah
On the Battlefield of Kuruksetra Arjuna thought that killing his relatives would be an abominable, irreligious activity, motivated only by his desire to acquire a kingdom. He therefore desisted from the battle, thinking, “I would be the killer of my relatives. They would be destroyed.” Thus Arjuna was afflicted with mundane consciousness.
Lord Krsna here explains to Uddhava the circumstances in which Sri Arjuna posed his questions.