One Piece Strong Words: Book 1 and Book 2 (ONE PIECE STRONG WORDS 上下巻 One Piece Strong Words: Book 1 and Book 2?) are two books which list quotes from throughout the first 61 Volumes of the One Piece series, with analysis on common themes such as "setting off", "battle", "expectation", "wisdom", and "goodbyes". They contain commentary by Uchida Tatsuru (内田樹), a Japanese essayist, literary researcher, and a professor at Kobe College.