I bought it for the reason that it says it's a Christian classic, and also I'd heard a lot about this book while reading about Christian mysticism. It's such a great book. The author is warmhearted, witty, genial, down-to-earth, very mature, contemplative, deep type of a guy. After I left the book for a while, I had the sense of a "true peace" and a "comfort with God" ( his words in quotations ) when coming back to it.
Evelyn Underhill writes the Introduction and says " The MS from which it was made is unknown to us." It's still controversial who the author really was. But it was written around the latter half of the fourteenth century, England. There are so many things around and about him such as his other books, his being a cloistered monk, his being a Carthusian etc. which are still uncertain and unprovable.
No doubt that the book is a mystical treatise. It talks about how to get to God by going over the cloud of unknowing leaving behind the cloud of forgetting. All just have to be between you and God, other things else have to be forgotten. It's the "speedily springing unto God as a sparkle from the coal." There are two kinds of the church life, the active life and the contemplative life. The active life is the life of busying with all kind of religious activities such as helping the poor, the needy, and doing other charity works. The contemplative life "should be occupied, in reading, thinking, and praying" and "contemplative sitteth in peace with one thing." His view of praying is that, "Prayer in itself properly is not else, but a devout intent direct unto God, for getting of good and removing of evil." And God is, " The everlastingness of God is His length. His love is His breadth. His might is His height. And His wisdom is His deepness."
The quotations were just to let you know of how he writes and his main ideas. I would recommend this book for anyone, religious, or mystic. I love the author so much, he makes me feel that there's still something good left of our humanity.