An Apologetic is a field of study concerned with the systematic defence of Christianity. The term "apologetic" is derived from the Greek word apologia (απολογία), which means in defense of (also means "reply" or "answer").
The Apostles and early Christians preached Christ crucified and resurrected as a veritable fact, and were not in need of any scientific and philosophical structures and dialectical subtleties. And preachers themselves, in the name of Christ, performed miracles through their faith. At first, Christianity was accepted only through faith, and only later did faith itself become an object of reflection. Appearing in a Judeo-pagan world, Christianity, in defending itself from attach, was forced to disclose the delusions of the pagans and Hebrews. It was necessary to prove to the pagans that the Christian God is the true God; and to the Hebrews that Christ is the Messiah promised by the prophets. In answer to the persecutions of the governing powers, the Christians had to refute defamation and prove that they not only were not injurious to the government, but on the contrary, were very useful, in consequence of the high moral basis of the new teaching. This explains the character of early Christian Apologetics, 
- Sanctify the Lord God in your hearts, and be ready always to give an answer to every man that asks you a reason of the hope that is in you with meekness and fear - Source: I Peter 3:15
In Orthodox theology, term Apologetics is used in regards to defending the true faith against atheists, pagans, Jews and others. This defense, however, is done in a manner that is loving and in order to bear good fruits and should not be polemical or obsessive in manner, which in many cases is considered detrimental to the Apostolic Faith.
The earliest apologists were the Church Fathers. There apologies cover a wide range of topics including the Divine origin of the Church, Christ's Nature, Scripture, the Theotokos, miracles, Christian social interaction and the function of doctrine.
Orthodox Apologetics, however, has always tried to give an intellectual synthesis of both general and particular apologetic problems, using as a cornerstone the positive method of building the organically whole Christian worldview. The literature of Apologetics is unusually vast, diverse and almost boundless. But, from a strictly Orthodox point of view, a fully complete, whole and deeply absorbing textbook of Apologetics has not yet been prepared.
Modern Apologies and Apologists
The most recent and most controversial apologetic is that of Ecumenism and will not directly be addressed in this section. Among the various works on Apologetics written in the 19th and 20th centuries, worthy of note are:
- Ulrici (1806-1884), God and Nature;
- F. Hettinger (1819-1890), Apology of Christianity; and
- J. Ebrard (1818-1888), Apologetics.
- The (GOARCH) website has a list of Apologetics, see GOARCH Modern Apologetics
List of Orthodox apologetic work (chronological)
Early Church Fathers (various topics)
This list contains works related to Christian apologetics written by the early Church Fathers and follows a chronological listing.
- "The Fountain of Knowledge," by St. John of Damascus (7th-century).
Of the Orthodox Russian works in Apologetics, noteworthy are the classic work of:
- the Moscow Metropolitan, Macarius (Bulgakov), An Introduction to Orthodox Theology (6th edition, St. Petersburg, 1897);
- a remarkable two volume textbook for religious academies by Professor N. P. Rozhdestvensky, Christian Apologetics--A Course of Fundamental Theology, (2nd edition, St. Petersburg, 1893); and
- an original investigation of dogmatic theology from an apologetic point of view, by the Professor V. Rev. P. Y. Svetlov, Experiment of Apologetical Exposition of the Orthodox Christian Doctrine, Vol. I and Vol. II (Kiev, 1898).
These remarkable works have not lost their meaning even up to the present time.
Also deserving attention are some other Russian textbooks. For instance, Father Augustine's, A Manual of Fundamental Theology; Professor V. Rev. D. A. Tichomirov's, A Course in Fundamental Theology, St. Petersburg, 1887; Professor V. Rev. Kudryavtsev's, Short Course of Lectures in Orthodox Theology, (2nd edition, Moscow, 1898); Piatnitsky's, Fundamental Theology; Eleonsky's, Brief Report on Fundamental Theology; Petropavlovsky's, In Defence of Christian Faith Against Unbelief and several other works.
The Da Vinci Code apologetics
- The Da Vinci Code by Frederica Matthewes-Green (GOARCH)
- The Da Vinci Code:Decoding the Agenda by Rev. Fr. Theodore Stylianopoulos, Th.D. (GOARCH)
- The Da Vinci Code: The X-Files of Ancient Lies by Rev. Frank Marangos, D.Min.,Ed.D. (GOARCH)
- [Note: Excerpt from Orthodox Apologetic Theology by Ivan M. Andreyev, St. Herman of Alaska Brotherhood, 1995, p. 51-65]
- Orthodox Apologetic Theology by Ivan M. Andreyev, St. Herman of Alaska Brotherhood, 1995