The Cloud of Unknowing: A spiritual guide on contemplative prayer in the late Middle Ages. in Bloomington, MN

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.