Klesha (Sanskrit: क्लेश, IAST: Kleśa) is a Sanskrit word meaning "impurity", "corruption" or "poison".[1] In Hinduism, a klesha is a mental state, such as fear or ignorance, that clouds the mind and leads to unhealthy actions. It is an obstacle to reaching a state of enlightenment and liberation (moksha) from saṃsāra.[1]
The third śloka of the second chapter of Patañjali's Yoga Sūtras explicitly identifies the five poisons (pañcakleśā'):
अविद्यास्मितारागद्वेषाभिनिवेशाः पञ्च क्लेशाः॥३॥
Avidyāsmitārāgadveṣābhiniveśāḥ pañca kleśāḥ[2]
Translated into English, these five kleshas are:[2]
According to the Yoga Sutras, there are four stages for overcoming the effects of the kleshas: the active stage (udaram), the detached stage (vicchinna), the decaying stage (tanu) and the dormant stage (parsupta).[1]
The Yoga Sutras of Patanjali describe suffering as an impediment to spiritual growth.[1] Yogic practices such as meditation and pranayama breathing exercises provide methods to overcome afflictions.[1] According to Shiva Purana 2.3.5 and Hathatatvakaumudi, klesha refers to suffering (i.e. suffering caused by penance).[4][5]