This book was written in Latin by Augustine of Hippo (354 - 430) to discuss the Trinity in relation to God the Word (logos). Even though it is not as well known as some of his other writings, it is considered by many to be his masterpiece and of more doctrinal importance than either the Confessions or the City of God. St. Augustine is considered a saint in the Catholic Churches, the Eastern Orthodox Church, and the Anglican Communion. He is ranked among the doctors of the Church in the Roman Catholic Church.

The Enchiridion, or as it is sometimes titled, Faith, Hope, and Love, is a short treatise on Christian piety, written in response to a request soon after the death of St. Jerome in 420. The essay was meant to serve as a model for Christian instruction (catechesis).

The City of God is one of the most important works of Christian history and philosophy ever written. The writings of St. Augustine are as intriguing to the casual reader as it is to Christian researchers. St. Augustine's work provides insight into Western thought and the development of Western civilizations. The City of God provides the reader with an artful contrast between earthy cities and those in heaven as a representation of the eternal struggle between good and evil. The City of God was originally penned in the early 5th century as a response to the prevalent belief that Christianity was to blame for the fall of Rome. St. Augustine is known as one of the most influential Fathers of the Catholic Church. Born November 13, 354, Augustine would eventually be recognized as a Saint by the Catholic Church, the Eastern Christian Church, and the Anglican Communion.

The Apostolic Fathers are the Christian writers from the first and second centuries who are thought to have been disciples of the Apostles or to have been so directly influenced by the Apostles that their writings are considered echoes of genuine Apostolic teaching. Their writings form a link of tradition that binds these writings to those of the New Testament. Chief among the apostolic fathers are the three first-century Bishops: St. Clement of Rome, St. Ignatius of Antioch, and St. Polycarp of Smyrna, who were disciples of St. Peter and St. John.

This classic by St. Basil the Great (329-379) gives eloquent exposition of the doctrine of the Trinity, showing how there is distinction and yet communion among the divine Persons. Although not the Spirit "God", St. Basil demonstrates that he, like the Son, shares the same nature as the Father.

One of the great early Christian writings of the second century, The Demonstration of the Apostolic Preaching is a book all true believers can learn from. In writing to his friend, Irenaeus unfolds the Christian faith by quoting extensively from the Old Testament.

In this book, Justin Martyr boldly defends the Christian faith before the Roman government. He addresses the core beliefs of the early church and refutes the lies spread abroad about them. A truly inspirational piece of literature that should not disappoint the hungry soul looking for pure doctrine and teaching. He truly was a man of God that held great understanding of godly virtue and wisdom. May you be abundantly blessed as you partake in this book!

Summa Theologica consists of three main parts. The second part is divided two, and this recording presents Prima Secundae - Part I of Part II. Taken in its entirety, Summa Theologica forms an essential contribution to the canon of Catholic doctrine and was written in the last decade of his life by Thomas Aquinas (1225-1274), an Italian-born Dominican friar. Although he died before completing it, the body of thought it contains is a continuing influence to the education and guidance of students of theology in the main Christian traditions.

In this classic book, John of Damascus laboured to form one complete, clear, and brief theological work that would summarize all Christian doctrine that had been passed down and agreed upon. The following was said of the book: The result was an inexhaustible storehouse of tradition in which nothing is to be found that has not been either approved by the ecumenical synods or by the established leaders of the Church.

A comprehensive explanation of Martin Luther’s most crucial and controversial beliefs on salvation, The Bondage of the Will is a critical resource in understanding the theology of free will and the gift of faith. Facing criticism even from others who had disagreements with the Catholic church, Luther’s strong and absolute beliefs on the gift of salvation were truly revolutionary. This work contains the full amount of research, discussion, and debate on Luther’s ideas on free will as it pertains to individual Christians and to their understanding of God.

The resurrection from death is a strong component of the Christian faith, which the Nicene Creed, affirms stating: "We look for the resurrection of the dead, and the life of the world to come." The early Christian writers Irenaeus and Justin Martyr, in the second century, wrote against the widespread idea of their time that only the soul survived. In like manner, we have this later writing of St. Gregory of Nyssa (335-395 AD) which clearly articulates the position that a person is both soul and body and that Christ has promised to raise them both.

With prophetic insight into our times, Benedict warns of a "radical manipulation of man" in the name of tolerance, insisting that the only "authentic counterweight to every form of intolerance" is Christ himself—and Christ crucified. A lifelong Catholic, the late pope pays tribute to some of the giant figures of Christianity who have served him through the years as guiding stars: his predecessor Pope John Paul II, the 20th-century German Jesuit martyr Alfred Delp, and the silent carpenter Joseph, his patron saint.

Once in a generation, a historian will redefine his field, producing a book that demands to be read or heard - a product of electrifying scholarship conveyed with commanding skill. Diarmaid MacCulloch's Christianity is such a book. Breathtaking in ambition, it ranges back to the origins of the Hebrew Bible and covers the world, following the three main strands of the Christian faith.

St. Ambrose (CE 340-397), bishop of Milan, felt strongly that virginity was one of the principle virtues. He was very successful in persuading maidens to adopt chaste religious vocations, so much so that many a mother refused to permit her daughter to listen to him. At one point, the saint was compelled to refute the accusation that he was depopulating the state. He did this by appealing to the young men of his age that they should not have any difficulty in finding wives.

Institutes of the Christian Religion is John Calvin's seminal work on Protestant systematic theology. Highly influential in the Western world and still widely read by theological students today, it was published in Latin in 1536 and in his native French in 1541. The book serves as an introductory textbook on the Protestant faith for those with some previous knowledge of theology and covers a broad range of theological topics from the doctrines of church and sacraments to justification by faith alone and Christian liberty.