要保持劍的鋒利就得磨拭，要保持頭腦靈光就得看書。"A mind needs books like a sword needs a whetstone."

要保持劍的鋒利就得磨拭，要保持頭腦靈光就得看書。─電影《權力的遊戲》
"A mind needs books like a sword needs a whetstone."