"In a very clear and wonderful way, under the guise of physical warfare, the Gita describes the duel that perpetually goes on in the hearts of each one of us; a fight of dharma, justice, against adharma, evil, injustice. The battle takes place not only on the fields of Kurukshetra but also on the elusive dharmakshetra 'field of dharma', a spiritual field within each of us where all moral struggles are waged."
January 1, 1970
https://en.wikiquote.org/wiki/Bhagavad_Gita