All of the episode titles in season 8 are lines that were said in season 1. The episode title comes from a line Damon says to Stefan in the Pilot (2009). The full line is "I promised you an eternity of misery so I'm just keeping my word." Damon also says this line to Stefan in a flashback to 1864 in S01E22 Blood Brothers (2010). The full quote is, "You got what you wanted-- you and me for all eternity. But hear this brother, I will make it an eternity of misery for you."
Damon also says this line to Stefan in a flashback to 1864 in S01E22 Blood Brothers (2010). The full quote is, "You got what you wanted-- you and me for all eternity. But hear this brother, I will make it an eternity of misery for you."