Here are the contexts of the quotes tweeted from @sueannbowling between October 23 and October 29, 2014. All but the last are from Mort, by Terry Pratchet.
“Death must be the loneliest creature in the Universe.” Mort realizes this when Death has disappeared.
“Funny thing about eyebrows. You never really noticed them until they’d gone.” Cutwell has been trying to create fireworks.
“DEATH IS WHOEVER DOES DEATH’S JOB.” Mort, as he finds he is taking on more and more of Death’s attributes, including the VOICE.
“When you step off a cliff, your life takes a very definite direction.” Mort, when he challenges Death for Keli’s life.
“YOU COULD HAVE HAD ETERNITY.” Death to Mort, after the battle is over. Mort’s reply? “I’ve been very lucky.”
“He may know himself better than you know him.” Sue Ann Bowling, Homecoming. Marna, speaking to Lai about Roi.