Apologetics (from Ancient Greek ἀπολογία (apología) 'speech in defense') is the religious discipline of defending religious doctrines through systematic argumentation and discourse. Early Christian writers (c. 120–220) who defended their beliefs against critics and recommended their faith to outsiders were called Christian apologists. In 21st-century usage, apologetics is often identified with debates over religion and theology.
Christian apologetics (Ancient Greek: ἀπολογία, "verbal defense, speech in defense") is a branch of Christian theology that defends Christianity.
Christian apologetics have taken many forms over the centuries, starting with Paul the Apostle in the early church and Patristic writers such as Origen, Augustine of Hippo, Justin Martyr and Tertullian, then continuing with writers such as Thomas Aquinas, Duns Scotus, William of Ockham and Anselm of Canterbury during Scholasticism.
Lucius Caecilius Firmianus Lactantius (c. 250 – c. 325) was an early Christian author who became an advisor to Roman emperor Constantine I, guiding his Christian religious policy in its initial stages of emergence, and a tutor to his son Crispus. His most important work is the Institutiones Divinae ("The Divine Institutes"), an apologetic treatise intended to establish the reasonableness and truth of Christianity to pagan critics.
He is best known for his apologetic works, widely read during the Renaissance by humanists, who called Lactantius the "Christian Cicero". Also often attributed to Lactantius is the poem The Phoenix, which is based on the myth of the phoenix from Egypt and Arabia. Though the poem is not clearly Christian in its motifs, modern scholars have found some literary evidence in the text to suggest the author had a Christian interpretation of the eastern myth as a symbol of resurrection.
Preparation for the Gospel (Ancient Greek: Εὐαγγελικὴ προπαρασκευή, Euangelikē proparaskeuē), commonly known by its Latin title Praeparatio evangelica, is a work of Christian apologetics written by Eusebius in the early part of the fourth century AD. It was begun about the year 313, and attempts to prove the excellence of Christianity over pagan religions and philosophies. It was dedicated to Bishop Theodotus of Laodicea.
Eusebius devotes a considerable portion of the work to explaining what he sees as a debt that Greek philosophers owed to Hebrew culture.
Life of Constantine the Great (Ancient Greek: Βίος Μεγάλου Κωνσταντίνου, romanized: Bios Megalou Kōnstantinou; Latin: Vita Constantini) is a panegyric written in Greek in honor of Constantine the Great by Eusebius of Caesarea in the 4th century AD. It was never completed due to the death of Eusebius in 339. The work provides scholars with one of the most comprehensive sources for the religious policies of Constantine's reign. In addition to detailing the religious policies of the Roman Empire under Constantine, Eusebius uses Life of Constantine to engage several of his own religious concerns, such as apologetics, as well as a semi-bibliographic account of Constantine.
Valentinianism was one of the major Gnostic Christian movements. Founded by Valentinus (b. c. 100 CE – d. c. 165 CE) in the 2nd century, its influence spread widely, not just within the Roman Empire but also from northwest Africa to Egypt through to Asia Minor and Syria in the east. Later in the movement's history, it broke into Eastern and a Western schools. The Valentinian movement remained active until the 4th century, declining after Emperor Theodosius I issued the Edict of Thessalonica in 380, which established Nicene Christianity as the state religion of the Roman Empire.
No evidence exists that Valentinus was labeled a heretic during his lifetime. Irenaeus of Lyons, who was the first patristic source to describe Valentinus's teachings—though likely incompletely and with a bias toward the time's proto-orthodox Christianity—did not finish his apologetic work Against Heresies until the latter 2nd century, likely sometime after Valentinus's death. The rapid growth of the Valentinian Gnostic movement—named eponymously after Valentinus—after his death prompted early Christian thought leaders, such as Irenaeus and later Hippolytus of Rome, to write apologetic works against Valentinus and Valentinianism, which conflicted with proto-orthodox theology. Because the proto-orthodox camp's leadership encouraged the destruction of Gnostic texts writ large, most textual evidence regarding Valentinian theology and practice comes from its critics—particularly Irenaeus, who was highly focused on refuting Valentinianism.
The Cult of the Self (French: Le Culte du moi) is a trilogy of books by French author Maurice Barrès, sometimes called his trilogie du moi. The trilogy was influenced by Romanticism, and it also made an apology of the pleasure of the senses.
Gilbert Keith Chesterton KC*SG (29 May 1874 – 14 June 1936) was an English author, philosopher, Christian apologist, poet, journalist and magazine editor, and literary and art critic. Chesterton's wit, paradoxical style, and defence of tradition made him a dominant figure in early 20th-century literature.
Chesterton created the fictional priest-detective Father Brown, and wrote on apologetics, such as his works Orthodoxy and The Everlasting Man. Chesterton routinely referred to himself as an orthodox Christian and came to identify this position more and more with Catholicism, eventually converting from high church Anglicanism. Biographers have identified him as a successor to such Victorian authors as Matthew Arnold, Thomas Carlyle, John Henry Newman and John Ruskin.
Rudolf Otto (25 September 1869 – 7 March 1937) was a German Lutheran theologian, philosopher, and comparative religionist. He is regarded as one of the most influential scholars of religion in the early twentieth century and is best known for his concept of the numinous, a profound emotional experience he argued was at the heart of the world's religions. While his work started in the domain of liberal Christian theology, its main thrust was always apologetical, seeking to defend religion against naturalist critiques, making him a more conservative figure. Otto eventually came to conceive of his work as part of a science of religion, which was divided into the philosophy of religion, the history of religion, and the psychology of religion.