God
Quote 4
"so bent he seems
On desperate revenge that shall redound
Upon his own rebellious head" (3.84-6)
In Book 10, Satan's plans for revenge will "redound" upon him, just as God says it will here. Notice the use of the word "bent." Good characters – Adam, Eve, Abdiel – are often described as "upright" or "erect." Satan, in contrast, is "bent" on "revenge," a phrasing that suggests a connection between revenge and something opposed to uprightness.