यया धर्ममधर्मं च कार्यं चाकार्यमेव च |
अयथावत्प्रजानाति बुद्धि: सा पार्थ राजसी ||
yayā dharmam adharmaṁ cha kāryaṁ chākāryam eva cha
ayathāvat prajānāti buddhiḥ sā pārtha rājasī
हे पार्थ! मनुष्य जिस बुद्धि के द्वारा धर्म और अधर्म को तथा कर्तव्य और अकर्तव्य को भी यथार्थ नहीं जानता, वह बुद्धि राजसी है॥31॥
The intellect is considered in the mode of passion when it is confused between righteousness and unrighteousness, and cannot distinguish between right and wrong conduct.
English Translation Of Sri Shankaracharya’s Sanskrit Commentary By Swami Gambirananda
18.31 O Partha, sa, that; buddhih, intellect; is rajasi, born of rajas; yaya, with which; prajanati, one understands; ayathavat, wrongly, not truly, not by discerning it from all points of view; dharmam, virtue, as prescribed by the scritpures; and adharmam, vice, what is prohibited by them; [By dharma and adharma are implied the seen and the unseen results of actions as revealed by the scriptures; karya and akarya respectively refer to the actual doing of what ought to be done and the not doing of what ought not to be done.] ca eva, as also; karyam, what ought to be done; and akaryam, what ought not to be done-those very ‘duty’ and ‘what is not duty’ as stated earlier.