Hekiganroku - Case 99: Shukuso and the "Buddha with the Ten Bodies"

Emperor Shukuso asked the National Teacher Echu, 
  "What is the Buddha with the ten bodies who guides the living beings?"
The National Teacher said,
  "Sir! Go beyond the head of Vairokana [1]." 
The emperor said,
  "I don't understand it." 
The National Teacher said, 
  "Never consider yourself to be even the pure Dharma-body."

[1]: The Buddha of the pure Dharma-body.