I have noted the following among those works [of Isidore] that have come to my knowledge. He wrote the _Differentiae_, in two books, in which he subtly distinguished in meaning what was confused in usage; the _Proœmia_, in one book, in which he stated briefly what each book of the Holy Scriptures contains; the _De Ortu et Obitu Patrum_, in one book, in which he describes with sententious brevity the deeds of the Fathers, their worth as well, and their death and burial; the _Officia_, in two books, addressed to his brother Fulgentius, bishop of Astigi, in which he described in his own words, following the authority of the Fathers, why each and every thing is done in the church of God; the _Synonyma_, in two books, in which Reason appears and comforts the Soul, and arouses in it the hope of obtaining pardon; the _De Natura Rerum_, in one book, addressed to King Sisebut, in which he cleared up certain obscurities about the elements by studying the works of the church Fathers as well as those of the philosophers; the _De Numeris_, in one book, in which he touched on the science of arithmetic, on account of the numbers found in the Scriptures; the _De Nominibus Legis et Evangeliorum_, in one book, in which he revealed what the names of persons [in the Bible] signify mystically; the _De Haeresibus_, in one book, in which, following the example of the Fathers, he collected scattered items with what brevity he could; the _Sententiae_, in three books, which he adorned with passages from the _Moralia_ of Pope Gregory; the _Chronica_, in one book, from the beginning of the world to his own time, put together with great brevity; the _Contra Judaeos_, in two books, written at the request of his sister Florentina, a nun, in which he proved by evidences from the Law and the Prophets all that the Catholic faith maintains; the _De Viris Illustribus_, in one book, to which we are appending this list; one book containing a rule for monks, which he tempered in a most seemly way to the usage of his country and the spirits of the weak; the _De Origine Gothorum et Regno Suevorum et etiam Vandalorum Historia_, in one book; the _Quaestiones_, in two books, in which the reader recognizes much material from the old treatments; and the _Etymologiae_, a vast work which he left unfinished, and which I have divided into twenty books, since he wrote it at my request. And whoever meditatively reads this work, which is in every way profitable for wisdom, will not be ignorant of human and divine matters. There is an exceeding elegance in his treatment of the different arts in this work in which he has gathered well-nigh everything that ought to be known. There are also many slight works, and inscriptions in the church of God, done by him with great grace.[25]