These are the contexts of the quotes tweeted from @sueannbowling from September 26 through October 2, 2013. All but the last are from The Fellowship of the Ring, by J.R.R. Tolkien.
“You’ll want it, if you haven’t got it.” Sam, realizing as the fellowship sets out from Rivendell that he forgot to pack rope.
“Faithless is he that says farewell when the road darkens.” Gimli, when Elrond refuses to have the others of the fellowship swear to stay with Frodo.
“Let him not vow to walk in the dark who has not seen the nightfall.” Elrond’s response to Gimli.
“Sworn word may strengthen quaking heart.” Gimli again. Elrond responds, “or break it.”
“The wolf that one hears is worse than the orc that one fears.” Boromir, after the failed attempt to cross Redhorn Gate. They hear wargs howling, and the mines of Moria suddenly seem the lesser of two threats.
“Something has been disturbed that would have been better left quiet.” Gandalf, after Pippin has dropped a stone into the well in Moria. In the book this is a deliberate attempt to see how deep the well is.
“For once in my life can’t you let me do something I want to do, on my own?” Tourist Trap, by Sue Ann Bowling. Roi as a teenager is rebelling against his father’s protectiveness.