Cloud of unknowing

Let not, therefore, but travail therein till thou feel list.  For at the first time when thou dost it, thou findest but a darkness; and as it were a cloud of unknowing, thou knowest not what, saving that thou feelest in they will a naked intent unto God. This darkness and this cloud is, howsoever thou dost, betwixt thee and thy God, and letteth thee that thou mayest neither see Him clearly by light of understanD in they reason, nor feel Him in sweetness of love in thine afflection. 

Page 72  Cloud of unknowing

 
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