Cloud of Unknowing

Do not hang back then, but labor until you experience the desire. For when you first begin to undertake it, all that you will find is a darkness, a sort of cloud of unknowing; you cannot tell what it is except that you experience in your will a simple reaching out to God. This darkness and cloud is always between you and your God, no matter what you do and prevents you from seeing him clearly by the light of understanding in your reason and from experiencing him in a sweetness of love in your affection. So set yourself to rest in this darkness as long as you can, always crying out after him who you love. Fo if you are to experience him or to see him at all, insofar sit is possible here, it must always be in this cloud and in this darkness. So if you labor at it with all your attention as I bed you, I trust, in his mercy, that you will reach this point. 

Anonymous 14th Century monk who, unwittingly, expressed some key postmodern tenets.