यया धर्ममधर्मं च कार्यं चाकार्यमेव च | अयथावत्प्रजानाति बुद्धि: सा पार्थ राजसी ॥31॥
yayā dharmam adharmaṁ cha kāryaṁ chākāryam eva cha ayathāvat prajānāti buddhiḥ sā pārtha rājasī
yayā—by which; dharmam—righteousness; adharmam—unrighteousness; cha—and; kāryam—right conduct; cha—and; akāryam—wrong conduct; eva—certainly; cha—and; ayathā-vat—confused; prajānāti—distinguish; buddhiḥ—intellect; sā—that; pārtha—Arjun, the son of Pritha; rājasī—in the mode of passion
O Partha, that intellect is born of rajas with which one wrongly understands virtue and vice as also what ought to be done and ought not to be done.