The Avadhuta Gita: Song of the Ascetic (Unabridged‪)‬

The Avadhuta Gita is an independent treatise on Advaita and explains that doctrine in the most uncompromising terms. The word Avadhuta refers to a mystic who has done away with worldly concerns and standard social etiquette, at least in his or her heart. Such personalities are considered to be free to "roam the earth like a child". 

An avadhuta does not identify with their body or mind. Such a person is said to be pure consciousness in human form. Avadhuts play a significant role in many Yoga, Vedanta, and Bhakti traditions. Some are born free, and may appear in any class of society. Others wear next to nothing, and meditate a lot. And then there are others who may not be recognized for what they are, as they do not show off. They may live like ordinary people.