Bhagwad Gita 2.8 - 2.10 Krishna sweet, assuring yet Mysterious smile!

At the climactic moment, when the Pandava's most valuable and fierce warrior, Arjuna, states that he would not fight in the war, Krishna, his friend and charioteer, surprisingly enough, smiles! How could he smile given the dire situation his side would be put in if Arjun withdraws from the battle! These two verses and the mysterious smile of Lord Krishna builds up the suspense, the intrigue, that engages the reader or listener in the song of God, the Gita, to attend to rest of it that follows.