George R. R. Martin, A Song of Ice and Fire: Book One: A Game of Thrones (New York: Bantam Books, 1996) ("'[A]nd I have a mind . . . and a mind needs books as a sword needs a whetstone, if it is to keeps it edge.'" Id. at 101.).
George R. R. Martin, A Song of Ice and Fire: Book Two: A Clash of Kings (New York: Bantam Books, 1999).
George R. R. Martin, A Song of Ice and Fire: Book Three: A Storm of Swords (New York: Bantam Books, 2000) ("... Always keep your foes confused. If they are never certain who you are or what you want, they cannot know what you are like to do next. Sometimes the best way to baffle them is to make moves that have no purpose, or even seem to work against you. Remember that . . . when you come to play the game.'" Id. at 692.).
George R. R. Martin, A Song of Ice and Fire: Book Four: A Feast of Crows (New York: Bantam Books, 2005).
George R. R. Martin, A Song of Ice and Fire: Book Five: A Dance with Dragons (New York: Bantam Books, 2011) ("Stark said, 'In this world only winter is certain. We may lose our heads, it's true...but what if we prevail?' My father sent him on his way with his head still on his shoulder. 'If you lose' he told Lord Eddard, 'you were never here'.'" Id. at 132-133.).
James Lowder, ed., Beyond the Wall: Exploring George R. R. Martin's A Song of Ice and Fire: From A Game of Thrones to A Dance with Dragons, with a foreword by R. A. Salvatore (Dallas, TX: BenBella Books, 2012).