According to the background and aim of visiting scholars to Sui Dynasty, the popularity of Pure Land Religion in Japan and the warm reception to the visiting scholars of Sui Dynasty in Japan, I think calling Sui Dynasty "West" is a commendatory pun. It not only means the orientation but also implies the pure land world of the West. In the diplomatic letter written by the Japanese highest governor, it not only represents the geographical location but has the praise of religion, and it is the practical use of Pure Land Thoughts in the diplomacy, too.
