Build the space from two clouds. Below, 'put a cloud of forgetting beneath you, between you and everything that was ever created' — forget every concrete thing. Above, the cloud of unknowing you press into. You work in the gap between the two: forget the particular below, press into the unknown above. Every concrete thing you're holding in mind sits between you and the thing you're trying to reach.

— In our words · Source: The Cloud of Unknowing (Anonymous (14th-century English contemplative))