Kshetra Kshetrajna Vibhaga Yoga (Samskrit: क्षेत्रक्षेत्रज्ञविभागयोगः) is the title of the thirteenth chapter of the Bhagavad Gita. The theme of this chapter is the immortal atma with its physical embodiment. It sums what constitutes true knowledge. The message given here is to reach the self by understanding the difference between the field (body or prakrti) and the knower of the field (the purusha).