In connection with this outline also an attempt at adjustment is made. Christian doctrine is placed, somewhat inappropriately, under the head of ethical philosophy: “Wisdom (_prudentia_) is the recognition of the true faith and the knowledge of the Scriptures, in which one must have regard for the triple method of interpretation. The first is that by which certain things are taken literally without any figure, as the Ten Commandments; the second is that by which certain things in the Scriptures are taken in a double sense, both in the definite historic meaning and in accordance with the understanding of figures, as in regard to Sara and Hagar; first, because they existed in reality, second, because the two Testaments are figuratively denoted by them. The third kind is that which is taken in a spiritual sense only, as the Song of Songs. For if it is understood according to the sound of the words and their literal force, the result is bodily wantonness rather than the excellence of the inner meaning. After the definition of wisdom let us now give the parts of justice (_justitia_), of which the first is to fear God, to venerate religion, to honor parents, to love the fatherland, to help all, to harm none, to embrace the bonds of brotherly love, to face the dangers of others, to bring aid to the wretched, to repay a good turn, to observe equity in judgments.” (_Diff._, 2, 39.) BIBLIOGRAPHY[371] [371] The list given here is not a complete list of works consulted. The wide range of topics included in Isidore’s encyclopedia has made it necessary to consult a great many books, and the great modern encyclopedias have been used continuously, especially the 11th edition of the _Encyclopedia Britannica_. I. SOURCES Boetius, A. M. S. _Opera._ Migne, Patrologia Latina, vols. 63, 64. Boetius, A. M. S. _De Institutione Arithmetica libri duo, de Institutione Musica libri quinque. Accedit Geometria quae fertur Boetii._ Edited by Friedlein, Leipzig, 1867. _Breviarium Alaricianum._ Edited by Conrat, Leipzig, 1903. Cassiodorus. _Opera._ Migne, Patr. Lat., vols. 69, 70. Dionysius Thrax. _Ars Grammatica._ Uhlig, editor. Leipzig, 1883. Einhard. _Vita Caroli_ in _Monumenta Germaniae Historica, Scriptores_ (ed. Pertz). _Grammatici Latini._ 7 vols. Edited by H. Keil, Leipzig, 1857–1880. Hyginus, C. Julius. _Poeticon Astronomicon_, in vol. 1 of _Mythographi Latini_, edited by Thomas Muncker, Amsterdam, 1691. Isidore of Seville. _De Natura Rerum._ G. Becker, editor. Berlin, 1857. Isidore of Seville. _Opera._ Migne, Patr. Lat., vols. 81–84 (a reprint of the edition of Arevalus, Rome, 1796). Isidore of Seville. _Opera._ Edited by Du Breul. Paris, 1601. Isidore of Seville. _De Rhetorica_, in Halm, _Rhetores Latini Minores_. Martianus Capella. _De Nuptiis Philologiae et Mercurii._ Edited by Eyssenhardt, Leipzig, 1866.