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Apologetics (from Greek ἀπολογία, "speaking in defense") is the religious discipline of defending or proving the truth of 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.
The term "apologetics" derives from the Ancient Greek word apologia. In the Classical Greek legal system, two key technical terms were employed: the prosecution delivered the kategoria (κατηγορία), and the defendant replied with an apologia. To deliver an apologia meant making a formal speech or giving an explanation to reply and rebut the charges, as in the case of Socrates' Apologia defense, as chronicled in Plato's Apology (the defense speech of Socrates at his trial). This term appears in the Koine Greek of the New Testament. The Apostle Paul employs the term apologia in his trial speech to Festus and Agrippa when he says "I make my defense" in Acts 26:2. A cognate form appears in Paul's Letter to the Philippians as he is "defending the gospel" in Philippians 1:7, and in "giving an answer" in 1 Peter 3:15.
Although the term 'apologetics' has Western, primarily Christian origins and is most frequently associated with the defense of Christianity, the term is sometimes used referring to the defense of any religion in formal debate involving religion.
Many apologetic books have been written in defence of the history or teachings of the Bahá'í Faith. The religion's founders wrote several books presenting proofs of their religion, among them are the Báb's Seven Proofs and Bahá'u'lláh's Kitáb-i-Íqán. Later Bahá'í authors wrote prominent apologetic texts, such as Mírzá Abu'l-Fadl's The Brilliant Proof and Udo Schaefer et al.'s Making the Crooked Straight;.
One of the earliest Buddhist apologetic texts is The Questions of King Milinda, which deals with the Buddhist metaphysics such as the `no-self' nature of the individual and characteristics such as of wisdom, perception, volition, feeling, consciousness and the soul. In the mid-19th century, encounters between Buddhists and Christians in Japan prompted the formation of a Buddhist Propagation Society. In recent times, A. L. De Silva, an Australian convert to Buddhism, has written a book, Beyond Belief, providing Buddhist apologetic responses and a critique of Christian Fundamentalist doctrine. Gunapala Dharmasiri wrote an apologetic critique of the Christian concept of God from a Theravadan Buddhist perspective.
Christian apologetics combines Christian theology, natural theology, and philosophy to present a rational basis for the Christian faith, to defend the faith against objections and misrepresentation.
Christian apologetics has taken many forms over the centuries. In the Roman Empire, Christians were severely persecuted, and many charges were brought against them. J. David Cassel gives several examples: Tacitus wrote that Nero fabricated charges that Christians started the burning of Rome. Other charges included cannibalism (due to a literal interpretation of the Eucharist) and incest (due to early Christians' practice of addressing each other as "brother" and "sister"). Saul of Tarsus, Justin Martyr, Irenaeus and others often defended Christianity against charges that were brought to justify persecution.
Later apologists have focused on providing reasons to accept various aspects of Christian belief. Christian apologists of many traditions, in common with Jews, Muslims, and some others, argue for the existence of a unique and personal God. Theodicy is one important aspect of such arguments, and Alvin Plantinga's arguments have been highly influential in this area. Many prominent Christian apologists are scholarly philosophers or theologians, frequently with additional doctoral work in physics, cosmology, comparative religions, or other fields. Others take a more popular or pastoral approach. Some prominent modern apologists are Douglas Groothuis, Frederick Copleston, John Lennox, Walter R. Martin, Dinesh D'Souza, Douglas Wilson, Cornelius Van Til, Gordon Clark, Francis Schaeffer, Greg Bahnsen, Edward John Carnell, James White, Hank Hanegraaff, Ravi Zacharias, Alister McGrath, Lee Strobel, Josh McDowell, Peter Kreeft, G. K. Chesterton, C. S. Lewis, William Lane Craig, J. P. Moreland, Hugh Ross, David Bentley Hart, Gary Habermas, Norman Geisler and Scott Hahn.
Christian apologists employ a variety of philosophical and formal approaches, including ontological, cosmological, and teleological arguments. The Christian presuppositionalist approach to apologetics utilizes the Transcendental argument for the existence of God.
Tertullian was a notable early Christian apologist. He was born, lived and died in Carthage. He is sometimes known as the "Father of the Latin Church". He introduced the term Trinity (Latin trinitas) to the Christian vocabulary and also probably the formula "three Persons, one Substance" as the Latin "tres Personae, una Substantia" (itself from the Koine Greek "treis Hypostaseis, Homoousios"), and also the terms Vetus Testamentum (Old Testament) and Novum Testamentum (New Testament).
There are notable Latter-day Saint apologists who focus on the defense of Mormonism, including early church leaders such as Parley P. Pratt, John Taylor, B. H. Roberts, James E. Talmage and more modern figures such as Hugh Nibley, Orson Scott Card, and Jeff Lindsay.
Several well-known Mormon apologetic organizations, such as the Foundation for Ancient Research and Mormon Studies (a group of scholars at Brigham Young University) and the Foundation for Apologetic Information & Research (an independent, Mormon-run, not-for-profit group), have been formed to defend the doctrines and history of the Latter Day Saint movement in general and The Church of Jesus Christ of Latter-day Saints in particular.
Notable apologists within the Catholic Church include Bishop Robert Barron, G. K. Chesterton, Dr. Scott Hahn, Patrick Madrid, Kenneth Hensley, Karl Keating, Ronald Knox, Peter Kreeft, and Gus Loyd. Topics regarding Catholic history and doctrine presented by apologists and various lecturers are published and available for download. A Catholic apologetics website is Catholic Answers.
John Henry Newman (February 21, 1801 – August 11, 1890) was an English convert to Roman Catholicism, later made a cardinal, and beatified in 2010. In early life he was a major figure in the Oxford Movement to bring the Church of England back to its Catholic roots. Eventually his studies in history persuaded him to become a Roman Catholic. When John Henry Newman entitled his spiritual autobiography Apologia Pro Vita Sua in 1864, he was playing upon both this connotation, and the more commonly understood meaning of an expression of contrition or regret.
Deism is a form of theism in which God created the universe and established rationally comprehensible moral and natural laws but no longer intervenes in human affairs. Deism is a natural religion where belief in God is based on application of reason and evidence observed in the designs and laws found in nature. The World Order of Deists maintains a web site presenting deist apologetics that demonstrate the existence of God based on evidence and reason, absent divine revelation.
Hindu apologetics began developing during the British colonial period. A number of Indian intellectuals had become critical of the British tendency to devalue the Hindu religious tradition. As a result, these Indian intellectuals, as well as a handful of British Indologists, were galvanized to examine the roots of the religion as well as to study its vast arcana and corpus in an analytical fashion. This endeavor drove the deciphering and preservation of Sanskrit. Many translations of Hindu texts were produced which made them accessible to a broader reading audience.
A range of Indian philosophers, including Swami Vivekananda and Aurobindo Ghose, have written rational explanations regarding the values of the Hindu religious tradition. More modern proponents such as the Maharishi Mahesh Yogi have also tried to correlate recent developments from quantum physics and consciousness research with Hindu concepts. The late Reverend Pandurang Shastri Athavale has given a plethora of discourses regarding the symbolism and rational basis for many principles in the Vedic tradition. In his book The Cradle of Civilization, David Frawley, an American who has embraced the Vedic tradition, has characterized the ancient texts of the Hindu heritage as being like "pyramids of the spirit". A. C. Bhaktivedanta Swami Prabhupada translated over sixty volumes of classic Vedic scriptures including the biography and conclusions of the famous 16th century bhakti scholar Sri Chaitanya Mahaprabhu; many of these translations and commentaries have been further translated into as many as eighty languages, producing over half a billion books distributed throughout the world. Such individuals have tried to construct an intellectual defense of Hinduism during a phase when the fundamentalistic elements of other faiths have sought to denigrate the ancient religion in an effort to gain converts.
Jewish apologetic literature can be traced back as far as Aristobulus of Paneas, though some discern it in the works of Demetrius the chronographer (3rd century BCE) traces of the style of 'questions' and 'solutions' typical of the genre. Aristobulus was a Jewish philosopher of Alexandria and the author of an apologetic work addressed to Ptolemy VI Philometor. Josephus's Contra Apion is a wide-ranging defense of Judaism against many charges laid against Judaism at that time, as too are some of the works of Philo of Alexandria.
In response to modern Christian missionaries, and congregations that "are designed to appear Jewish, but are actually fundamentalist Christian churches, which use traditional Jewish symbols to lure the most vulnerable of our Jewish people into their ranks", Jews for Judaism is the largest counter-missionary organization in existence, today. Kiruv Organisation, founded by Rabbi Yosef Mizrachi, and Outreach Judaism, founded by Rabbi Tovia Singer, are other prominent international organizations that respond "directly to the issues raised by missionaries and cults, by exploring Judaism in contradistinction to fundamentalist Christianity." 
Plato's Apology may be read as both a religious and literary apology; however, more specifically literary examples may be found in the prefaces and dedications, which proceed many Early Modern plays, novels, and poems. Eighteenth century authors such as Colley Cibber, Frances Burney, and William Congreve, to name but a few, prefaced the majority of their poetic work with such apologies. In addition to the desire to defend their work, the apologetic preface often suggests the author's attempt to humble his- or herself before the audience.
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