Theoria Audiobooks

Athenagoras of Athens, an early Christian apologist of the 2nd century, authored On the Resurrection of the Dead around 177 AD to address both pagan skepticism and philosophical misunderstandings surrounding the bodily resurrection. In a Greco-Roman world where Platonic and Stoic thought dominated the masses, many viewed the resurrection of the body as either impossible or undesira

The fifth and final book of Against Heresies by Saint Irenaeus of Lyons begins by reaffirming the teachings of the Church, which have been preserved from the prophets through Christ and the apostles. He emphasizes the importance of the apostolic tradition and the integrity of the Church in maintaining the true faith. This foundation is crucial as he addresses the false teachings th

To Autolycus is an apologetic work by Theophilus of Antioch, written around 180 A.D. Although not much is known about the life of Theophilus, Eusebius and Jerome note that he was a defender against heresies. Sadly, To Autolycus is his only extant work. In 168 A.D. he became bishop of Antioch where he served until around 182 A.D. It bears noting here that this Theophilus of Antioch

Tatian's "Address to the Greeks," was written around 160-170 A.D. Originally a pagan, Tatian converted to Christianity after encountering Justin Martyr's teachings in Rome. After Justin's martyrdom, Tatian returned to Syria and established an influential Christian school. In "Address to the Greeks," Tatian condemns Greek moral decay and philosophical inconsistencies, asserting that

Book 4 of Against Heresies – the longest of the five books – is a critical defense of early Christian orthodoxy, addressing and refuting Gnostic beliefs. A significant portion of the Book defends the Old Testament against Gnostic claims of its irrelevance. In light of the Gnostic claim of secret knowledge, Irenaeus hearkens to Apostolic Tradition, noting its centrality to the C

In Book 3 of Against Heresies, Saint Irenaeus of Lyons continues his refutation of Gnostic teachings and elaborates on the unity and truth of the Christian faith. He begins by pointing out that the Apostles did not speak about the mysteries of God until they received gifts and power from the Holy Spirit. The fact that we have an unbroken lineage from the Apostles to our own day poi

Within the Second Book of Against Heresies, Saint Irenaeus endeavors yet again to lay bare the sophistries of the gnostic sects by demonstrating that neither the angels nor any supposed Demiurge distinct from a higher, supreme God created the universe. Instead, he shows that there is but one God – and it is this one God who created the Universe. Building upon his work in the firs

Against Heresies by Saint Irenaeus is a critique of the emerging heretical doctrines of the second century. Written around 180 A.D by the prominent Bishop of Lyons, the monumental work showcases Irenaeus’ comprehensive understanding of Sacred Scripture and Apostolic Tradition, as he passionately refutes the teachings of the Marcions and gnostics. Composed of five books total, Boo

The Dialogue with Trypho, composed around 155-160 AD, is a foundational work by the early Christian philosopher and apologist Saint Justin Martyr. Structured as a Socratic dialogue, it records Justin's debate with a Jewish man named Trypho, representing the contemporary discourse between Christians and Jews. In a dialectical style, Justin aims to demonstrate how the messianic proph

The second apology of Saint Justin Martyr was written during the second century as a defense of the Christian Faith against unjust persecution. At the time, Christianity was seen as a threat to the established pagan religious practices, resulting in sporadic outbreaks of violence against Christians.Tragically, the defense offered by Saint Justin Martyr was not enough to protect him