Anonymous 
The Cloud of Unknowing [EPUB ebook] 

The Cloud of Unknowing is an anonymous work of Christian mysticism written in the latter half of the 14th century. The text is a spiritual guide to contemplative prayer. ‘Be willing to be blind, and give up all longing to know the why and how, for knowing will be more of a hindrance than a help.’ This 1912 edition was edited by Evelyn Underhill, and contains her introduction.