Kleshas (Sanskrit: क्लेश, romanized: kleśa; Pali: किलेस kilesa; Standard Tibetan: ཉོན་མོངས། nyon mongs), in Buddhism, are mental states that cloud the mind and manifest in unwholesome actions.
In the Pali Canon's discourses (sutta), kilesa is often associated with the various passions that defile bodily and mental states.
In the Pali Canon's Sutta Piṭaka, kilesa and its correlate upakkilesa[1] are affective obstacles to the pursuit of direct knowledge (abhijñā) and wisdom (pañña).
For instance, the Samyutta Nikaya includes a collection of ten discourses (SN 27, Kilesa-saṃyutta) that state that any association of "desire-passion" (chanda-rāgo) with the body or mind[2] is a "defilement of mind" (cittasse'so upakkileso): More broadly, the five hindrances – sensual desire (kāmacchanda), anger (byāpāda), sloth-torpor (thīna-middha), restlessness-worry (uddhacca-kukkucca), and doubt (vicikicchā) – are frequently associated with kilesa in the following (or a similar) manner: Additionally, in the Khuddaka Nikaya's Niddesa, kilesa is identified as a component of or synonymous with craving (taṇhā) and lust (rāga).
XXII, 88), in the context of the four noble persons (ariya-puggala, see Four stages of enlightenment), the text refers to a precursor to the attainment of nibbana as being the complete eradication of "the defilements that are the root of the round" (vaṭṭa-mūla-kilesā).
In the Mahayana tradition, the five main kleshas are referred to as the five poisons (Sanskrit: pañca kleśaviṣa; Tibetan-Wylie: dug lnga).
Altogether, the five poisons are:[15][16] Wú zhī Yī liàn Yàn wù 愤怒 Fèn nù Xū róng Jí dù The Abhidharma-kośa identifies six root kleshas (mūlakleśa): In the context of the Yogācāra school of Buddhism, Muller (2004: p. 207) states that the Six Klesha arise due to the "...reification of an 'imagined self' (Sanskrit: satkāya-dṛṣṭi)".
[18] The Mahayana Mahaparinirvana Sutra lists approximately 50 kleshas, including those of attachment, aversion, stupidity, jealousy, pride, heedlessness, haughtiness, ill-will, quarrelsomeness, wrong livelihood, deceit, consorting with immoral friends, attachment to pleasure, to sleep, to eating, and to yawning; delighting in excessive talking and uttering lies, as well as thoughts of harm.