"Thirty spokes meet at a nave; because of the hole we may use the wheel. Clay is moulded into a vessel; because of the hollow we may use the cup. Walls are built around a hearth; because of the doors we may use the house. Thus tools come from what exists, but use from what does not". ( Tao Te Ching )

"He stretcheth out the North over the empty place , and hangeth the earth upon nothing". (Job 26, 7)

"You should call nothing empty, without saying of what it is empty the thing in question". (Hermes in a Treasury of Traditional Wisdom by W. Perry)

"Corporal man dies with sadness. Astral man passes with courage. Spiritual man rejoins God with joy. Before being able to leap into divine void one needs to climb for a long time the paths of aestheticism, on pain of sinking into the mud of chaos". ( L. Cattiaux, The Message Rediscovered 8, 17)