Verse
अर्जुन उवाच
प्रकृतिं पुरुषं चैव क्षेत्रं क्षेत्रज्ञमेव च ।एतद्वेदितुमिच्छामि ज्ञानं ज्ञेयं च केशव ॥
Arjuna said: Prakriti and Purusha, the Field and the Knower of the Field, Knowledge and the object of Knowledge, these I fain would learn, O Keshava.
Gītā 13·1