When he was stationed in Russia, he continued reading massive amount of books in a dark room and a doctor warned him that 'if you continue using your eyes in that way, you will lose your eyesight'.
ロシア駐在時、暗い室内で膨大な数の書物を読み込み続けたため、医者からは「これ以上目を使い続けると失明する」と忠告された。