Thomas Aquinas, the Doctor Angelicas of the Schools, treats the subject of Angels at great length in the first volume of his Summa Theologica , from Quaest. L to LXIV , and from Quaest. CVI to CXIV . He constantly quotes Dionysius, sometimes giving his exact words, but oftener amplifying and interpreting his meaning. In Quaest. CVIII he discusses the names of the Angels, and of the Seraphim and Cherubim speaks as follows:⁠—