Svecchacara
Svecchācāra (IAST; Sanskrit: स्वेच्छाचार) is an important concept in the Nath Sampradaya. 'Svecchācāra' means: acting as one likes, arbitrariness, acting without restraint. The word appears to be a combination of three Sanskrit words: sva (self), iccha (will), and cāra (deportment), essentially adding up to "behaving as one desires" or "in accordance with one's will (iccha)". John Woodroffe (1951: p. 440) associates it with notions of antinomianism and that it is evident in the Upanishads and Tantras:
"Lastly, the doctrine that the illuminated knower of Brahman (Brahmajnani) is above both good (Dharma) and evil (Adharma) should be noted. Such a one is a Svechacari whose way is Svechacara or "do as you will". Similar doctrine and practices in Europe are there called Antinomianism. The doctrine is not peculiar to the Tantras. It is to be found in the Upanishads, and is in fact a very commonly held doctrine in India." Woodroffe (1951: pp. 440–441) also goes on to state that:
"In Svecchacara there is theoretical freedom, but it is not consciously availed of to do what is known to be wrong without fall and pollution." Svecchācāra is important in the Nath Sampradaya evocation of their realized ideal, of the Avadhuta; as Mahendranath states:
"Sveccha means one's own wish or free will. Svecchachara means a way of life where one acts as one wishes and does what is right in one's own eyes. Doing one's own Will. The concluding Sanskrit expression in the Avadhoota Upanishad is "Svecchachara Paro." The term "Paro" means a mysterious or secret pattern to that action done by one's own Will. In other words, we do our Will but with discretion, not making it too obvious, nor to harm or hurt other people. Yet this is also a typical Nathism; a complete reversal of Vedic morals and philosophy. This term is employed in the closure of the Avadhuta Upanishad. The term 'svecchācāra' also appears nine times in the Mahanirvana Tantra first translated into the English from Sanskrit by Woodroffe (1913). Svechchhachara, “following one's own [true] will” is also evident in the Kali Tantra 8.19. See also
 True Will

Notes

Hindu tantra
Upanishadic concepts
Vedanta