Christianity
Free to read here, from Project Gutenberg.
The Confessions of St. Augustine
The Pilgrim's Progress from this world to that which is to come
The Imitation of Christ
The First Book of Adam and Eve
Jesus the Christ
Doctrina Christiana
Orthodoxy
The Book of Mormon
Summa Theologica, Part I (Prima Pars)
Heretics
Hymns for Christian Devotion
The Story of a Soul (L'Histoire d'une Âme): The Autobiography of St. Thérèse of Lisieux
Commentary on the Epistle to the Galatians
Summa Theologica, Part I-II (Pars Prima Secundae)
Summa Theologica, Part II-II (Secunda Secundae)
Deuterocanonical Books of the Bible
Grace Abounding to the Chief of Sinners
The Standard Oratorios: Their Stories, Their Music, And Their Composers
The Gospel of Luke, an exposition
Disputation of Doctor Martin Luther on the Power and Efficacy of Indulgences
The Existence and Attributes of God, Volumes 1 and 2
The Practice of the Presence of God the Best Rule of a Holy Life
Summa Theologica, Part III (Tertia Pars)
True Christianity
Concerning Christian Liberty; with Letter of Martin Luther to Pope Leo X.
The St. Gregory Hymnal and Catholic Choir Book
The Story of the Hymns and Tunes
A History of the Moravian Church
Selections from the Table Talk of Martin Luther
Spiritual Torrents
A Treatise on Good Works
A Short Method of Prayer
The Smalcald Articles
The Otterbein Hymnal
Hymns and Spiritual Songs
Deaconesses in Europe and their Lessons for America
The Psalms of David
Science and Health, with Key to the Scriptures
Miscellaneous Writings, 1883-1896
Expositions of Holy Scripture
An Open Letter on Translating
Expositions of Holy Scripture: Romans Corinthians (To II Corinthians, Chap. V)
The Analogy of Religion to the Constitution and Course of Nature
The Old Franciscan Missions Of California
The Hymns of Prudentius
Prayers Written At Vailima, and A Lowden Sabbath Morn
Divine Songs