The Cloud of Unknowing (Middle English: The Cloude of Unknowyng) is an anonymous work of Christian mysticism written in Middle English in the latter half of the 14th century. The text is a spiritual guide on contemplative prayer in the late Middle Ages. The underlying message of this work proposes that the only way to truly "know" God is to abandon all preconceived notions and beliefs or "knowledge" about God and be courageous enough to surrender your mind and ego to the realm of "unknowingness," at which point, you begin to glimpse the true nature of God.
The book counsels a young student to seek God, not through knowledge and intellection (faculty of the human mind), but through intense contemplation, motivated by love, and stripped of all thought. This is brought about by putting all thoughts and desires under a "cloud of forgetting", and thereby piercing God's cloud of unknowing with a "dart of longing love" from the heart. This form of contemplation is not directed by the intellect, but involves spiritual union with God through the heart:
"For He can well be loved, but he cannot be thought. By love he can be grasped and held, but by thought, neither grasped nor held. And therefore, though it may be good at times to think specifically of the kindness and excellence of God, and though this may be a light and a part of contemplation, all the same, in the work of contemplation itself, it must be cast down and covered with a cloud of forgetting. And you must step above it stoutly but deftly, with a devout and delightful stirring of love, and struggle to pierce that darkness above you; and beat on that thick cloud of unknowing with a sharp dart of longing love, and do not give up, whatever happens."