For what purpose did Lord Krsna speak Bhagavad gita?

Bhagavad-gita is the essence of Vedic knowledge and one of the most important Upanisads in Vedic literature. Lord Sri Krsna spoke it five thousand years ago to the prince Arjuna on the Battlefield of Kuruksetra. The series decodes the profound philosophy of Bhagavad Gita and makes it accessible to everyone.