Concept

Lesson 1.3, A Brief History of Apologetics

Intro

When a Christian today defends the faith in a conversation, an essay, or a YouTube video, they are not starting from scratch. They are joining a line of believers who have been doing this work in every Christian century since the 100s. The line is about 1,900 years long, and each era's defenders faced their own cultural problem, worked out their own move, and left it as a tool the next generation could use.

In the second century, when Christians were accused of being atheists (because they refused to worship Roman gods) and cannibals (because of misunderstood rumors about the Lord's Supper), Justin Martyr wrote his First Apology directly to the Roman emperor and was eventually beheaded for the faith he defended. In the fourth and fifth centuries, when Rome itself collapsed and pagans blamed the Christians, Augustine wrote City of God to show that the real city Christians belong to is not Rome.

In the medieval centuries, when faith and reason looked like they might be split apart, Anselm worked out the ontological argument and Aquinas built a massive system stitching Aristotle and Scripture together. In the early modern centuries, when Enlightenment skepticism rose, Pascal probed the human heart, Joseph Butler argued that the same problems skeptics raised about Scripture they already accepted in nature, and William Paley sketched the design argument.

The twentieth century opened a different challenge: a post-Christian West that no longer assumed the basics. C.S. Lewis wrote for ordinary readers, made apologetics accessible from a fireside chair, and gave the modern era Mere Christianity, Miracles, and the Trilemma. Cornelius Van Til went after the deep assumptions of secular thought. Francis Schaeffer brought the work to artists and cultural elites at L'Abri. Alvin Plantinga and William Lane Craig rebuilt the academic respectability of Christian philosophy and trained the current generation.

The work is not finished, and the writers and pastors carrying it forward today (Plantinga, Craig, Keller, and many others) are not the end of the line either. This lesson is the map of who came before, what pressure each one faced, and which moves they left in the toolkit. The student of apologetics is not learning a museum collection. They are stepping into a working trade that has been continuously practiced for almost twenty centuries.

In full

Apologetics has been done in every Christian century since the second, under pressure from persecution, hostile philosophies, civilizational collapse, and shifts in intellectual fashion. Each era's apologists faced a particular cultural challenge and worked out a particular move. The moves are still in use. Taking up this work means joining a witness about 1,900 years deep.

Required reading

• Justin Martyr, the first major Christian apologist. Read his page to anchor the patristic era. His First Apology to the Roman emperor, and his death for the faith he defended, set the shape of the work for the next eighteen centuries.
• Augustine, patristic example. City of God and Confessions, taken together, are the largest-scale Christian apologetic project of the patristic era.
• Apologetics, return once more to the master discipline hub and read the history section. The page places the figures below in their broader streams.

Key takeaways

• The patristic apologists (2nd-5th centuries) defended Christians from political and philosophical attack. Justin, Athenagoras, Irenaeus, Tertullian, Origen, and Augustine answered the charges of atheism (because Christians refused pagan worship), immorality (because of slander about the Lord's Supper and the love-feast), social subversion (because they refused emperor cult), and intellectual nonsense (because they preached a crucified Messiah). They built the patterns the church still uses.
• The medieval apologists (11th-13th centuries) tied faith and reason together. Anselm formalized "faith seeking understanding" and produced the ontological argument. Aquinas worked Aristotle together with Christian revelation into one system and gave the church the Five Ways. Faith does not stand against reason. It uses reason and disciplines it.
• The early modern apologists (17th-19th centuries) answered Enlightenment skepticism. Pascal probed the human condition for hints of God. Butler argued that the problems skeptics raised about Scripture were no worse than the problems they already accepted in nature. Paley argued from design. Each one tried to meet the rationalism and deism of their century on its own ground.
• The 20th-century apologists rebuilt the discipline for a post-Christian West. Lewis wrote for ordinary readers and made apologetics popularly accessible. Van Til pressed worldview-level critique against the roots of secularism. Schaeffer brought the work to late-modern cultural elites. Plantinga and Craig restored apologetics to the academic respect it had lost.
• Today's apologists carry the work into the present. Plantinga, Craig, Keller, and a wider group of working philosophers and pastors continue the historic work in present-day debates. The line is not closed. The student of this course is joining a living tradition, not studying a museum.

The line, walked in one paragraph each

What follows is a thumbnail of each major apologist's signature move and the pressure of their era. Each one is worth a deeper read. The codex has many of them as full people pages.

Justin Martyr (c. 100-165), patristic founder. The Roman empire persecutes Christians on charges of atheism, immorality, and political disloyalty. Justin writes the First Apology directly to the emperor. He defends Christians as good citizens, answers the charges, and presents Christ as the fulfillment of what Greek philosophers were reaching for. His logos spermatikos idea says that seeds of the Logos were scattered among the pagans, so that pagan thinkers sometimes said true things by partial share. He is beheaded for the faith he defended.

Athenagoras (around 175), patristic continuation. Athenian Christian philosopher who writes A Plea for the Christians to Marcus Aurelius. Same charges as Justin. A sharper philosophical defense, especially of monotheism against the slander of "atheism." Here apologetics takes the public-letter form, addressed to rulers, written for educated readers.

Irenaeus of Lyons (c. 130-202), patristic anti-heresy work. Against Heresies is the church's first major apologetic against false teaching inside the church, especially against Gnostic systems that distorted Christian revelation. Justin's outward-facing apologetic against pagans meets Irenaeus's inward-facing apologetic against heretics. Both are required by the Bible (Jude 3, Titus 1:9 again).

Tertullian (c. 155-220), patristic Latin polemic. Apologeticus defends the church before Roman provincial authorities. Against Marcion answers the heretic who rejected the Old Testament and the Creator. Tertullian gives Western Christianity its early theological vocabulary, including the word trinitas. Famous for asking "What has Athens to do with Jerusalem?", though his actual practice engages with philosophy more than the line suggests.

Origen (c. 185-253), patristic engagement with Greek philosophy. Contra Celsum is the church's most sustained answer to a sophisticated pagan critic. Celsus had written a wide-ranging philosophical attack on Christianity (The True Word) about seventy years earlier. Origen takes it down line by line. He models careful, fair-minded, philosophically informed answers.

Augustine (354-430), patristic synthesis. Confessions is autobiographical apologetic. God's pursuit of Augustine becomes the model conversion narrative. City of God is the largest-scale apologetic-historical-theological work of the era. It was written in response to pagan charges that Christianity caused the sack of Rome in 410. Augustine sets a pattern still in use: a cultural crisis prompts a grand-scale apologetic project.

Anselm (1033-1109), medieval program. Fides quaerens intellectum, faith seeking understanding. Anselm argues from inside faith outward, not from outside in. The Proslogion gives the ontological argument. Cur Deus Homo gives the satisfaction theory of atonement. His posture is prayer before argument. The Proslogion is itself addressed to God.

Aquinas (1225-1274), high scholastic synthesis. The Summa Theologiae and the Summa Contra Gentiles bring together Aristotelian philosophy, biblical revelation, and the patristic inheritance into one coherent system. The Five Ways are the medieval backbone of natural theology. You will meet them again in Module 3. Aquinas's confidence that reason rightly used will not contradict faith rightly held is the heart of the classical apologetic method.

Pascal (1623-1662), early modern apologetic of the heart. Mathematician and physicist. In the Pensées, he probes the human condition, the misery, the greatness, the boredom, the longing, as signs pointing toward the God of Abraham, Isaac, and Jacob. Here apologetics is not only argument but diagnosis. He saw earlier than most that Enlightenment rationalism would not be answered by counter-rationalism alone. It would also need an appeal to the heart's actual state.

Joseph Butler (1692-1752), Anglican defensive apologetic. The Analogy of Religion (1736) answered Enlightenment deism with a comparison: the problems with revealed religion are no worse than the problems already in natural religion that the deists accepted. If you grant the one you cannot reject the other. A model of meeting opponents on their own ground.

William Paley (1743-1805), early modern design argument. Natural Theology (1802) opens with the famous watchmaker analogy. It became the most widely read English-language design argument of the nineteenth century. Darwin read it as a young man and admired it. Modern intelligent-design discussions still talk back to Paley.

C. S. Lewis (1898-1963), modern popular apologetics. Mere Christianity, Miracles, The Problem of Pain, The Abolition of Man. He was a literary scholar at Oxford and Cambridge, not an academic theologian. That is part of his secret. Lewis wrote for ordinary readers in a voice they could hear. Half a century after his death, he is the most-read modern apologist. The pastoral-popular voice in this course owes more to him than to any other modern. See C.S. Lewis.

Cornelius Van Til (1895-1987), modern presuppositionalist. Dutch-Reformed philosopher and theologian at Westminster Theological Seminary. He argues that the unbeliever's worldview cannot hold together on its own and that only Christianity provides the preconditions for thinking itself. The transcendental argument, the impossibility of the contrary, is his signature move. Lesson 1.5 returns to it.

Francis Schaeffer (1912-1984), modern cultural apologetics. Founder of L'Abri in Switzerland. Host to a generation of seekers, doubters, and counterculture refugees. The God Who Is There, Escape from Reason, He Is There and He Is Not Silent. Schaeffer brought apologetic work into engagement with art, philosophy, and the cultural mood of the late twentieth century. He is also a bridge between the older Reformed apologetic and the culturally engaged mode of the late-modern church.

Alvin Plantinga (b. 1932), Reformed epistemology. The leading living figure in Christian philosophy. In God and Other Minds, Warrant and Proper Function, and Warranted Christian Belief, he argued that belief in God can be properly basic. It can be rational without being inferred from arguments. Reformed epistemology, the school he is most known for, is one of the five major apologetic methods today. Lesson 1.5 returns to it.

William Lane Craig (b. 1949), contemporary classical apologetics. The most prolific and visible defender of the Kalam cosmological argument and the resurrection. Reasonable Faith is the standard contemporary textbook. Craig's public-debate ministry and academic output, taken together, have done more than any single person to restore the cosmological argument to academic respect over the last forty years. You will meet him again in Module 3.

Tim Keller (1950-2023), contemporary pastoral apologetics. Founding pastor of Redeemer Presbyterian in Manhattan. Author of The Reason for God and Making Sense of God. Keller did sustained apologetic work in a deeply secular urban setting. He gave the church a model of pastor-as-apologist that stands apart from the conference-and-debate model. He showed that the local church, faithfully shepherded, is itself an apologetic.

This is a selective walk. There are many others, Cyril of Jerusalem, John of Damascus, John Henry Newman, G. K. Chesterton, Dorothy L. Sayers, J. Gresham Machen, John Frame, Greg Bahnsen (Greg Bahnsen), Richard Swinburne (Richard Swinburne), Gary Habermas (Gary Habermas), Sean McDowell (Sean McDowell), and others. The point of this survey is the shape of the witness, not its completeness.

Reflection questions

1. Of the apologists above, which posture most resonates with you, and which least? Sit with both answers. The one that least resonates may be the one you most need to learn from.
2. The patristic apologists wrote under threat of execution. The medievals wrote inside Christendom. The moderns wrote against an increasingly post-Christian culture. Today's apologists work inside late-modernity. How does the cultural setting change what apologetic moves are needed? Which setting most resembles yours?
3. Augustine wrote City of God during the sack of Rome. Anselm prayed his arguments before writing them. Justin died for the faith he defended. Lewis lost his wife to cancer. Apologetic work has always been done by people, not by disembodied minds. What in your life is shaping your apologetic, and what should it be shaping?
4. Most of the names here are men. Most are Western. Most are professional theologians or philosophers. What apologetic voices and witnesses are not on this short list? How would the church's apologetic be poorer if you only knew the names above?

Practice exercise

Pick one of the apologists above whom you have never read directly. In the next week, read at least one short primary text by them, the preface of Justin's First Apology, the prologue to Anselm's Proslogion, a chapter of Lewis's Mere Christianity, the opening of Pascal's Pensées, or the first lecture of Schaeffer's The God Who Is There. Note what surprises you. The point is to meet one of the witnesses, not just to know their name.

Next lesson

→ Lesson 1.4, The Apologist's Life, character requirements, gentleness and reverence, the trap of argument addiction, prayer, and the apologist's relationship with the local church.