Mahabharata offers four examples of bad men called Dushta Chatushtaya. The first one is Shakuni (Duryodhana’s maternal uncle). Shakuni was all the time filled with bad thoughts (Dhuralochana). He is a total stranger to good ideas. He was always plotting something bad for someone or other. Duryodhana had Shakuni as his advisor. Duryodhana was engaged in dhuscharya (bad deeds). They were comrades in evil. Then came Dusshasana (Duryodhana’s brother). In association with Shakuni and Duryodhana, Dhushasana became notorious for his Dush-pravartana (bad behaviour). When these three evil-minded men came together, “even stars fell during daytime,” they say. The whole cosmos rebels against such evil-minded men. Karna, out of a false sense of Durabhimanam (bad attachment), joined this trio. Gratitude is doubtless a good quality. Because Duryodhana came to his rescue on a critical occasion, Karna developed a wrongful attachment to him. Karna was a good-natured person, noble-minded. But because he was associated with evil-minded men, he also became bad. Despite his valour, physical prowess and intellectual abilities, Karna met with disaster, as he made himself remote from God. Evil thoughts, evil deeds, evil conduct, and attachment to the evil-minded – these are Dushta Chatushtaya (the four evil persons). – Divine Discourse, Mar 04, 1993.