that of bliss (sreyas, श्रेयस्), praising the latter. The hymns of Rig Veda in Book 10 Chapter 136, mention Muni (मुनि, monks, mendicants, holy man), with characteristics that mirror those found in later concepts of renunication-practising, Moksha-motivated ascetics (Sannyasins and Sannyasinis). These Muni are said to be Kesins (केशिन्, long haired) wearing Mala clothes (मल, dirty, soil-colored, yellow, orange, saffron) and engaged in the affairs of Mananat (mind, meditation). Scharfe states, "there are abundant references both to the trivarga and caturvarga in Hindu literature throughout the ages". Purushartha-focused literature Each of these four canonical puruṣārthas was subjected to a process of study and extensive literary development in Indian history. This produced numerous treatises, with a diversity of views, in each category. Some Purushartha-focused literature include, On Dharma These texts discuss dharma from various religious, social, duties, morals and personal ethics perspective. Each of six major schools of Hinduism has its own literature on dharma. Examples include Dharma-sutras (particularly by Gautama, Apastamba, Baudhayana and Vāsiṣṭha) and Dharma-sastras (particularly Manusmṛti, Yājñavalkya Smṛti, Nāradasmṛti and Viṣṇusmṛti). At personal dharma level, this includes many chapters of Yogasutras. The Book I of the Tamil moral text of the Tirukkural exclusively focuses on aram, the Tamil term for dharma, although the entire work of the Tirukkural keeps dharma as its base. On Artha Artha-related texts discuss artha from individual, social and as a compendium of economic policies, politics and laws. For example, the Arthashastra of Kauṭilya, the Kamandakiya Nitisara, Brihaspati Sutra, and Sukra Niti. Olivelle states that most Artha-related treatises from ancient India have been lost. The Book II of the Tirukkural primarily focuses on porul, the Tamil term for artha. On Kama These discuss arts, emotions, love, erotics, relationships and other sciences in the pursuit of pleasure. The Kamasutra of Vātsyāyana is most well known. Others texts include Ratirahasya, Jayamangala, Smaradipika, Ratimanjari, Ratiratnapradipika, Ananga Ranga among others. While the Book III of the Tirukkural primarily focuses on inbam, the Tamil term for kama, it remains unique in the sense that, unlike the Kamasutra, the Tirukkural's Book of Inbam remains a poetic appreciation of flowering human love as explicated by the Sangam period's concept of intimacy, known as agam in the Tamil literary tradition. On Moksha These develop and debate the nature and process of liberation, freedom and spiritual release. Major treatises on the pursuit of moksa include the Upanishads, Vivekachudamani, Bhagavad Gita, and the sastras