《元史·列传·卷九十五》
九年中书省臣及枢密院臣议论说： 若先打日本，因不知日本对元朝是顺是逆，恐会留下话柄。
九年，中书省臣及枢密院臣议曰： 若先有事日本，未见其逆顺之情。
In the ninth year, the ministers of the Zhongshu Province and the ministers of the Privy Council discussed saying: If we attack Japan first, as we do not know if Japan will be for or against the Yuan Dynasty, it is feared that we may open ourselves to criticism.