from the gandavyuha:
When it is said that phenomena exist, each one is inherently empty;
when it is said that phenomena do not exist, that does not destroy appearances.
Therefore the absolute and the mundane, existence and nonexistence, completely change into each other and embellish each other. Since the totality, individuality, sameness, difference, integration, and disintegration of all phenomena simultaneously revolve around each other in an interrelated array, this is called the method of arrays of revolving letters.