The voluminous Works of Saint Augustine, especially his “Confessions.” Mabillon, Tillemont, and Baronius have written very fully of this great Father. See also Vaughan’s Life of Thomas Aquinas. Neander, Geisler, Mosheim, and Milman indorse, in the main, the eulogium of Catholic writers. There are numerous popular biographies, of which those of Baillie and Schaff are among the best; but the most satisfactory book I have read is the History of M. Poujoulat, in three volumes, issued at Paris in 1846. Butler, in his Lives of the Saints, has an extended biography. Even Gibbon pays a high tribute to his genius and character.