Although Buddhist scriptures are usually read in the Wu reading, in the Shingon sect it is chanted in the Han reading of Chinese characters based on the Chinese pronunciation at the time when "Rishu-kyo" was introduced into Japan.
普通、経典は呉音で読まれるのが一般的であるが、真言宗では『理趣経』が日本に伝来した時代の中国語の音から漢音で読誦する。