In the Mahabharata, Shakuni represents Anumana (doubt). Karna symbolises Avishwasam (lack of faith). When these two come together, Asuya (envy) in the form of Duryodhana emerges. Envy is accompanied by wickedness in the form Dushasana. When the four came together, the fate of the Kauravas was sealed. The Kauravas represent bad thoughts, bad intentions, bad actions and bad attachments. (SSS Vol.26, pp. 293-294)