How we cite our quotes: Book Number, Line Number
Quote #1
"and enraged might see
How all his malice served but to bring forth
Infinite goodness, grace, and mercy shown
On Man by him seduced, but on himself
Treble confusion, wrath and vengeance poured" (1.216-20)
Satan's plans to get revenge will backfire; all his "malice" does exactly the opposite of what he wants because it serves to "bring forth/ Infinite goodness." Also, he will experience "treble confusion," a state not unlike that in which he finds himself at the beginning of the poem. In a sense, then, he will end up right where he began when he made his plans for revenge.
Quote #2
"and by proof we feel
Our power sufficient to disturb His Heav'n,
And with perpetual inroads to alarm,
Though inaccessible, His fatal throne,
Which if not victory is yet revenge" (2.101-5)
Moloch proposes that the fallen angels continue to batter God's throne through what he earlier calls "open war" (2.51). Here, he importantly suggests that achieving "victory" is not necessarily as important as being really annoying. He wants to make "perpetual inroads," almost like some annoying insect, because this will at least be some form of "revenge," which is not necessarily synonymous with victory, but is just as valuable.
Quote #3
"Thither full fraught with mischievous revenge
Accurst, and in a cursèd hour, he hies" (2.1054-5)
Satan's "revenge" is "mischievous." So much is clear. Notice the repetition of "curse" in both "accurst" and "cursed," as if we could forget that Satan is up to no good and that his actions will certainly have consequences. The same type of repetition is evident in the alliteration of "full fraught" and "he hies," a technique that makes the line memorable while also emphasizing Satan's evil dedication.