Zen / Christian Mysticism Conversation: The Cloud of Unknowing

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 suggests that the way to know God is to abandon consideration of God's particular activities and attributes, and be courageous enough to surrender one's mind and ego to the realm of "unknowing," at which point, one may begin to glimpse the nature of God.
-Pseudo-Dionysius the Areopagite "At the core is a mystical approach to Christian prayer, in which God is found not through rote knowledge, but through 'blind love.' It has been described as Christianity with a Zen outlook."

TheCloudofUnknowing
                                                    http://sacred-texts.com/chr/cou/index.htm

Śūnyatā 
(Sanskrit, also shunyata; Pali: suññatā), translated into English as emptiness, voidness,^[1] openness,^[2]spaciousness, or vacuity, is a Buddhist concept which has multiple meanings depending on its doctrinal context. InTheravada Buddhism, suññatā often refers to the not-self (Pāli: anatta, Sanskrit: anātman)^{[note 1]} nature of the five aggregates of experience and the six sense spheres. Suññatā is also often used to refer to a meditative state or experience.

related:
http://www.tertullian.org/fathers/areopagite_03_divine_names.htm