The term "Udasin" implies to be above all worldly attachments and is also used to denote the follower of this philosophy. In Srimad Bhagwat Gita lord Krishna says udasino gata vyatha which means udasin is free from all afflictions of the mind. Udasin sect originated from Sankadikas, the four sons of Brahma- the creator (one of the trinities), who renounced the world in quest of realising the supreme and treaded the path of asceticism.
Curiosity and love for wisdom are probably as old as beginning of mankind. India has given numerous philosophers and saints to the world. In India there are many sects that teach various methods of achieving one common goal of this human life which is self-realisation. Udasin sect is no exception.
In early ages seekers of udasin sect preferred leading a solitary life dedicating most of their time to performance of rituals in the form of tapasya (penance). Penance is a way of getting established in a state of bliss where duality ends and the seeker is freed from all disturbances of mind. Established in this state an udasin rises above the opposing emotions like joy-sorrow, friendship-enmity, good-bad etc. As in order to climb up the stairs, it is necessary to learn the art of balancing and walking, similarly to achieve the supreme, it is important to first realise your own self.
Around five hundred years ago the sect was rejuvenated by Acharya Shrichandra, who is known as the 165Th preceptor of the udasin sect. Though he proposed the pantheistic worship system, his teachings are based on the Monastic tradition, which maintains that there is one Supreme power that regulates the whole universe. His teachings are mainly based on understanding one's own nature which is the foundation of the Sanatana Dharma.
To be Udasin means to remain undisturbed in all circumstances enabling the seeker to remain steadfast in quest for achieving the highest objective of this human form - Self-Realisation.