Foreword & Introduction

Book text · 4th, corrected edition 2026

DEDICATION

To my beloved wife, whom God has placed at my side and who sustains my ministry—in gratitude and love.

Foreword

This book is intended as a practical handbook for defending the faith. It is aimed primarily at Christians in everyday life—ordinary church members who want to learn to bear witness to their faith firmly grounded in God's Word. My concern has been to develop the ideas accessibly, so that they remain understandable not only to theologically trained readers but also to every Christian.

Furthermore, this handbook can also be useful for Bible school students and theology students. Training in particular often leaves little room for applying apologetic principles in practice. This book seeks to fill a gap here: by offering guidance in biblical thinking and equipping readers for practical conversation, rather than establishing new theories.

To make everyday application easier, you will find reflection questions at the end of each chapter section. The QR code at the end of this book takes you directly to CHRISTOlogisch's Apologetics Coach. There, by entering the section number, you can choose whether you want to (1) ask comprehension questions about a section, chapter or the entire book, (2) receive answers to the reflection questions or (3) practice the content through simulated dialogues and discussions. In this way, what you read remains more than theory; step by step it is carried into conversation and practice.

That is also why I have deliberately placed readability above a strictly academic form. Footnotes document and develop the statements further, but should not hinder the flow of reading and are therefore placed at the end of the book. I have marked important passages with subtle emphasis to increase clarity.

My prayer is that this book—whether you are a church member, Bible school pupil or student—will strengthen you in firmly trusting God's Word and passing it on courageously. For scripture itself alone is the unshakable ground of truth, knowledge and meaning. May this handbook encourage you to stand up for the Lord clearly and winsomely in conversation with skeptics, with people of other faiths and in your church.

Josef Dražil

Introduction

Imagine standing at the edge of a construction site. Two houses are to be built. One on solid rock, the other on seemingly firm sandy ground. The builders begin simultaneously. Construction on the sand proceeds faster—the earth is soft, the ground easy to work. The house soon stands there, shining in the sun.

The other construction drags on. The rock is hard. Building a foundation on it costs time, effort and sweat. But then comes the day no one expected: A tremendous storm approaches. Rain lashes down, the wind howls, the earth shakes. The next morning the result is visible: The house on the sand is a single heap of rubble. But the house on the rock stands unshaken—as though nothing had happened.

Jesus himself tells precisely this story in Matthew 7,24-27. Whoever listens to him is like a wise builder erecting his house on solid rock. But whoever ignores his words is like a foolish person building on sand. It is a simple but relentless truth: The foundation determines whether a building stands or falls — in life as in thought.

Two kinds of wisdom—from above or below

But what is this foundation? Many think it is their own reason, their experiences or the collective wisdom of an educated society. Others rely on philosophical systems or scientific models. Still others depend on vague feelings, intuitions and the hope that “everything will turn out all right.”

The Lord Jesus makes a fundamental distinction:

“And he said to them: You are from below, I am from above; you are of this world, I am not of this world.” (John 8,23)

He thereby draws a clear line between two completely opposed starting points for thought:

• One wisdom is “from above”—divine, eternal, revealed in Christ and set down in God's Word, the Bible.
• The other is “from below”—earthly, bound to time, marked by human weakness and, as James puts it, ultimately “earthly, natural, demonic” (Jas 3,15).

James describes “wisdom from below” (Jas 3,15) not as one of several possible wisdoms but as a unified, godless wisdom comprehensively characterized by three features.

It is first earthly (ἐπίγειος, epigeios)—restricted to the visible, perishable and material things of this world. This wisdom looks only at what lies “under the sun” (cf. Eccl 1,9), without considering heavenly and eternal perspectives. Its thought remains bound to the temporal and perishable and is incapable of grasping true spiritual realities (cf. Col 3,1-2; Phil 3,19).

Furthermore, it is natural (ψυχική, psychikē)—meaning it arises from the natural human unrenewed by God's Spirit (cf. Jude 19). This is wisdom originating not in the Holy Spirit's illumination but in humanity as it is after the Fall: fully human, yet without spiritual discernment. The natural person (psychikos anthrōpos) cannot grasp the things of God's Spirit, “for they are foolishness to him” (1Cor 2,14).

Finally, this wisdom is demonic (δαιμονιώδης, daimoniodēs)—under the direct influence of the powers of darkness. Behind this kind of thinking stand not merely human errors but ultimately the seductive lies of satanic powers (cf. 2Cor 4,4; 1Tim 4,1).

James thereby makes clear: This wisdom is thoroughly corrupt; it is shaped by the world, twisted by sinful nature and directed by the devil. It stands in irreconcilable opposition to “wisdom from above,” which is pure, holy and revealed in God's Word.

Especially in defending the faith, it is crucial to name this opposition openly. Worldview systems resting on human reason, traditions or worldly philosophies may seem impressive on the surface. In truth, however, they are entangled in this “earthly, natural, demonic” wisdom that lacks any foundation in truth.

The destructive power of false foundations

The apostle Paul urgently warns against precisely this danger:

“Take care that no one carries you off as spoil through philosophy and empty deceit, according to human tradition, according to the elements of the world, and not according to Christ.” (Colossians 2,8)

Paul sets a clear alternative against these “elements of the world”: “...not according to Christ!” Christ is the true, sound foundation and the only source of genuine knowledge, for in him “all the treasures of wisdom and knowledge are hidden” (Col 2,3). Anyone grounding their worldview—that is, the comprehensive explanation of how everything is to be understood: what truth is, what is good and evil, what humanity is here for, what life means—on human principles and traditions remains trapped in this world's lower structures of thought.¹ These “elements of the world” may seem modern and progressive, but ultimately they are only old errors in new clothing. They permeate almost every area of public life:

• In naturalism, humanity is reduced to a mere chance product of matter. The origin of life, consciousness and morality is supposedly explicable through chemical processes alone. Human life's dignity, value and purpose thereby lack any objective foundation—in such a worldview they are nothing but illusions of a soulless brain.
• In humanism, humanity itself stands at the center of all considerations. It is elevated to the measure of all things while God is systematically displaced from every sphere of life. The question of objective criteria for good and evil is consistently excluded.
• In relativism, it is claimed that there is no longer any objective truth. Everything is declared a matter of perspective. Yet while professing tolerance, it tolerates precisely not the Gospel's absolute truth. Ironically, relativism elevates the claim “There is no absolute truth” itself to absolute truth.
• In materialism, only the material counts as real and original. Everything—including thought, consciousness, will and morality—is reduced to physical and chemical processes in the brain. Humanity is no longer God's image but a chance product of blind natural laws. This yields an attitude to life in which prosperity, consumption and possessions become the highest goal. Success is measured by bank balance, reputation and material goods. Humans are degraded to consumers whose lives are determined by “having” rather than “being” (cf. Lk 12,15). Their dignity, responsibility, hope—everything is devalued through matter's filtering lens. What remains is an empty human in an empty world.
• In postmodernism, finally, the boundaries between true and false, good and evil, male and female become blurred. Identity is declared a mere construct, and even the most obvious biological facts are denied.² Humanity tries to redefine itself—detached from its Creator.

One thing unites all these currents: They express “wisdom from below”—earthly, natural, demonic (Jas 3,15)—and form part of the “elements of the world” (ta stoicheia tou kosmou) against which Paul warns in Colossians 2,8.

But anyone making Christ the starting point of their thought breaks with these destructive systems of thinking. They leave the shaky foundation of human wisdom and place their life on the solid ground of divine revelation.

Only thus does humanity find the truth that truly sets free (Jn 8,31-32), wisdom that truly sustains (1Cor 1,30) and the foundation that will stand even in God's judgment (Mt 7,24-27).

Every philosophy that does not take its starting points and criteria from divine revelation in Christ is at heart “empty deceit” (Col 2,8)—however educated and reasonable it presents itself as being. Only thought renewed from above (Rom 12,2) can attain true knowledge and offer a sound foundation for life and thought.

Every person thus faces an inescapable decision: Do I want to build on God's wisdom or human wisdom?

There is no neutral ground. Anyone professing to be “merely reasonable” already relies on a particular kind of wisdom—either that which comes from above or that which is from below.

Here the decisive question arises: On what foundation does your worldview rest?

Whether consciously or unconsciously—every person lives with a worldview. A worldview is like an invisible spectacle lens through which we interpret everything: life's meaning, good and evil, truth and lies, hope and guilt. It shapes our thinking, feeling and acting—often without our noticing. No one therefore lives neutrally. Even someone claiming to “believe in nothing” thereby adopts a fundamental conviction, namely that it is better to believe in nothing. Even someone never consciously asking these questions—Where do I come from? Where am I going? What is good? Whom can I trust?—nevertheless lives every day with answers to them. For no human could live without such an inner framework of thought. Everyone believes something, and this belief determines how they see the world.

But like every building, a worldview also needs a sound foundation. We call this foundation an axiom—a fundamental conviction that cannot be proved but must be presupposed. An axiom stands at the beginning. It is like the first fixed point from which one can continue building. It answers the basic question: What do I begin with if I want to understand, assess or believe anything at all? No human can think without such a starting point. One could say: An axiom is not the result of our thought but the starting point with which it begins at all.

An axiom resembles a house's foundation. It supports the entire building—every wall, every floor, every detail. If it is firm and straight, the house stands. If it is crooked or brittle, the entire building becomes unstable and sooner or later collapses.

Every worldview, as a comprehensive explanation of the world, rests on such an axiomatic fundamental conviction, often without people being aware of it:

• The Christian says: “The Bible alone is God's Word.”
• The naturalist³ says: “Only nature exists, and it explains itself.”
• The relativist⁴ says: “There is no objective truth.”
• The skeptic⁵ says: “Nothing can be known with certainty.”

The problem is: Only one foundation truly withstands life's burdens, and that is the Word of the living God. Everything else is sand.

What is an axiom, and why is it decisive?

The expression “the elements of the world” (Col 2,8) literally designates “basic constituents” or “elementary principles.”⁶ Originally it could refer to the world's material elements (such as earth, water, air and fire), but also to fundamental systems of thought and order that determine human life. These are thus the deeply rooted convictions and assumptions people mostly unconsciously presuppose as self-evident. They answer basic life questions such as: “What really matters?”, “What gives my life meaning?”, “What is right and what is wrong?”, “Is there a higher order, or is everything merely chance?”. These systems of thought and order shape people's daily thinking, deciding and acting—whether concerning family, work, ethics, politics or religion. Someone convinced, for example, that “the stronger wins” or “everyone should do what makes them happy” acts on such unconscious basic assumptions—the “elements of the world” criticized by Paul. In the ancient world, particularly Hellenistic philosophy, these “elements” stood for the seemingly fixed principles by which the world was explained and ordered. They were the basic assumptions, the “axioms” of the world systems of that time, which were no longer questioned.

An axiom⁷ is a fundamental assumption with which every system of thought begins. It is the first and most fundamental conviction, the starting point on which everything else builds. From here everything further is explained, assessed and situated. An axiom is no result of logical inferences. It stands at the beginning and is presupposed. Axioms are characterized by the fact that they cannot be proved by derivation from other convictions, for they would then no longer be the foundation but themselves dependent on something else. They must be justified another way, for example by showing that no meaningful thinking or living is possible without them.

These insights have far-reaching consequences and matter for our apologetic commission (1Pet 3,15): Every person has faith and nothing but faith. Because everyone—consciously or unconsciously—has a worldview, and because every worldview begins with at least one unprovable axiom, every conceivable position is a position of faith. Christians, Muslims, Hindus and so on are not “the believers” as opposed to naturalists, atheists, skeptics and so on. All are “believers” in this sense. There is no neutral, faith-free position. Recognizing this is one of the first great and liberating insights when examining worldviews and their foundations.

Faith is therefore no special sphere for a few religious people but every person's unavoidable foundation. And precisely here this book's approach begins: The decisive question is not whether one has axioms—everyone does—but whether these axioms are sound.

The path of absurdity—worldviews exposed through their own contradiction

Every person has such axiomatic presuppositions, consciously or unconsciously.

An example: Anyone saying “Only what I can see and measure is truly real” has thereby formulated their axiom.

But logically examining this axiom immediately exposes it as untenable: For the statement itself—“Only the measurable is real”—can be neither seen nor measured. Logically, there are only two possibilities: Either this statement is true or it is false. If it is false, one need concern oneself with it no further. Yet this statement is false even if one assumes it true, because it destroys itself. For the claim “Only the measurable is real” itself cannot be measured and would therefore not be real at all by its own criterion. However one turns it: The statement is false in every conceivable case. It is false if it is false, and it is also false if one presupposes it true, because it refutes itself. This necessarily entails: This axiom not only cannot be true—it is logically impossible that it could ever be true! Its impossibility is grounded in its own inner contradictoriness. It already carries the seed of its refutation within itself. Anyone uttering it has thereby already definitively refuted it.

Here the reduction to absurdity begins:

One shows that the assumed axiom does not meet its own criteria. It is as though someone built a house, but on sand rather than rock. At first everything seems stable, logical and well considered. But the taller the house grows, the more weight rests on the supporting thought, the more cracks appear. Finally the whole building collapses under its own claim. For a foundation unable to support itself can support nothing else either. Anyone erecting a worldview on such an axiom will ultimately be overwhelmed by their own logic, not because the opponent was too strong but because the ground beneath their feet gave way.

And this is precisely how this apologetic approach proceeds:

• It exposes the hidden or unconscious basic assumptions of other worldviews.
• It shows that these presuppositions contradict themselves and cannot meet their own criteria.
• And it makes clear that only a single axiom passes this examination, which can be formulated thus: The Bible alone is the true and reliable Word of God.

By examining an axiom for internal consistency, we reduce the entire worldview built upon it to absurdity. For if the foundation is unsound, the whole building collapses—however impressive it may appear from outside.

This is the great strength of this apologetic approach: We need not refute every individual conviction and argument of a false worldview. We attack the foundation directly. Once the axiom is exposed as untenable, the entire system of thought collapses. This collapse occurs not through external arguments but through the inner logical tension we make visible and intensify until it discharges itself.

This fundamentally distinguishes this approach from classical and evidential apologetics.⁸

• Classical apologetics attempts step by step, with the aid of human reason, to establish the probability of God's existence and then defend the Bible's truth on this basis.
• Evidential apologetics attempts to substantiate Christian faith as credible and true through evidence from history, archaeology or natural science.

Both approaches laboriously work on the building of worldviews, stone by stone. But they usually presuppose a “neutral ground” on which one can meet the non-Christian. The Bible, however, teaches that this neutral ground does not exist (Mt 12,30; Jn 3,19-20).⁹

The power of the axiomatic approach

For the reasons given, the axiomatic approach you encounter in this book proceeds differently. It does not meet unbelief on unbelief's own terrain but shows:

• The Bible's foundation—the axiomatic fundamental conviction “The Bible alone is God's Word”—is absolutely sound.
• This axiom explains not only faith but also the reality in which we all live.

“Axiomatic” in this context means proceeding from a firm, fundamental starting point that is not itself justified further but presupposed. In this book, that means: The Bible—God's revealed Word—is posited as the ultimate criterion of truth, knowledge and meaning. This approach is not arbitrary but follows from scripture's own nature, presenting itself as God's authoritative speech (cf. Heb 1,1-2; 2Tim 3,16). Anyone acknowledging God as the highest source of all things must also accept his Word as the highest source of knowledge. An axiomatic approach is therefore not merely logically necessary but also biblically commanded: It begins not with human doubt but with God's authority. Within this book, “axiomatic” is therefore synonymous with “biblical,” for it means thinking, judging and arguing from God's Word. And more: One can also rightly speak of a Christ-centered approach. For anyone acknowledging God's revealed Word as axiom just as Christ himself did during his time of humiliation submits to the claim of lordship of the one who himself is the incarnate Word (Jn 1,14), through whom God has spoken finally (Heb 1,2) and in whom all the treasures of wisdom and knowledge are hidden (Col 2,3).

Only on this biblical foundation can all life's great questions be answered meaningfully and consistently:

• Truth: What is true? Only God's Word gives a definitive answer (Jn 17,17).
• Knowledge: How can we know anything with certainty at all? The Bible supplies the prerequisite for knowledge (Prov 1,7; Col 2,3).
• Logic: Why are there logical laws valid everywhere and always? Because they are anchored in God's immutable being, who is the Logos and created everything (Jn 1,1-3) and sustains all things (Heb 1,2-3).
• Moral values: Why do we know that certain things are objectively good or evil? Because God is the absolute criterion of good and evil (Ps 25,8; Isa 6,3; Lev 11,44; Mt 19,17).
• The lawfulness of nature: Why is nature ordered and investigable? Because God is a God of order (1Cor 14,33).
• Love, justice, beauty, dignity: All these values find their true meaning and highest expression only in the biblical worldview—grounded in God's own person (1Jn 4,16; Ps 89,15; Ex 33,18; Ps 8,6).

While all other axioms refute themselves, precisely the opposite holds for the biblical axiom: The Bible not only can be true—it must be true, because without it nothing else is explicable. The opposite of its truth is not merely false but logically impossible. The biblical axiom cannot be logically denied, because doing so destroys logic's foundation.

The Bible is the only foundation bringing with it everything necessary for its own confirmation. It is self-attesting, self-authenticating and stands unshakable as the only rock amid collapsing worldviews.

The apologetic approach pursued here exposes other worldviews' hidden basic assumptions. It shows that they contradict themselves and cannot meet their own criteria. And it makes clear that only one single axiom passes this examination: The Bible alone is the true and reliable Word of God.

The weapons of light—the spiritual battle over strongholds of thought

Like every building, a worldview also needs a sound foundation. We call this foundation an axiom (cf. p. 10: “What is an axiom, and why is it decisive?”). As we seek to show, no stable worldview foundation is possible without God's revelation. Only what is founded on the rock of God's Word can withstand all natural forces. And precisely here the biblical criterion begins. Already in the Old Testament, this principle is described figuratively. In Isaiah 28,17 God says:

“And I will make justice the measuring line and righteousness the plumb line. And hail will sweep away the refuge of lies, and the waters will wash away the shelter.”

God himself announces that human edifices of lies—strongholds of thought setting themselves against truth—will collapse under the force of his justice and righteousness. Ezekiel 13,13-14 likewise says:

“Therefore, thus says the Lord, YHWH: I will unleash a storm wind in my fury, and flooding rain will come in my anger, and hailstones in fury, for destruction. And I will tear down the wall you have coated with whitewash and cast it to the ground so that its foundation is laid bare; and it shall fall, and you shall perish within it. And you shall know that I am YHWH.”

This makes clear: Behind human edifices of thought that appear splendid and firm often hides nothing but brittle substance. God's rain and storm expose these weak foundations mercilessly. This is precisely what we use in this apologetic approach. Figuratively speaking, we unleash the storm and floods of divine truth to show that these splendid but hollow edifices of thought cannot withstand serious examination.

This is no mere intellectual exercise but direct obedience to scripture's commission:

“For although we walk in the flesh, we do not wage war according to the flesh; for the weapons of our warfare are not fleshly but divinely powerful for destroying strongholds; destroying reasonings and every lofty thing raised against the knowledge of God, and taking every thought captive to the obedience of Christ,” (2. Corinthians 10,3-5)

This is true apologetic warfare: not on the field of human speculation but with the divine weapons of the Word and truth. We expose the contradictions of other worldviews, tear down intellectual strongholds and bring unbelief to collapse. This happens not through human powers of persuasion but through the irresistible power of God's Word.

This battle is fought not with harshness or arrogance but with gentleness, patience and love. For the goal is not to defeat people but to lead them to knowledge of the truth. As Paul writes:

“The Lord's servant must not quarrel, but be gentle toward everyone, able to teach, patient, correcting opponents with gentleness, in case God may grant them repentance leading to knowledge of the truth, and they may recover their senses from the devil's snare, having been captured by him for his will.” (2. Timothy 2,24-26)

Our goal is to bring down strongholds of thought through truth's power and lead the people imprisoned within them into the Gospel's freedom.

As already mentioned, every worldview rests on such an axiom, often without people being aware of it:

• The Christian says: “The Bible alone is God's Word.”
• The naturalist says: “Only nature exists, and it explains itself.”
• The relativist says: “There is no objective truth.”
• The skeptic says: “Nothing can be known with certainty.”

The approach you encounter in this book makes precisely this clear. It helps you become aware of your own foundation in faith and defend it courageously. At the same time, you learn to expose other worldviews' “hidden foundations” and show that they fail at the decisive moment.

You learn to stand on the solid rock Jesus Christ himself promised (Matthew 7,24-27). And you learn how to confront others' brittle foundations with truth's floods—just as a house collapses in a storm if built on sand.

This is the power of this apologetic approach:

• You do not defend the faith piece by piece as though you had to prove every individual Bible verse and doctrine separately.
• You defend the faith as a complete, coherent whole standing on an unshakable foundation: God's Word.
• And simultaneously you expose other worldviews as what they are: fragile, contradictory edifices of thought unable to withstand any storm of life.

A few examples:

• The naturalist says: “Only nature exists.” ➞ But then he cannot explain why morality, logic or human worth exists at all.
• The relativist says: “There is no objective truth.” ➞ But is this statement itself objectively true, then?
• The skeptic says: “Nothing can be known with certainty.” ➞ How can he then be certain of that?

Do you see how quickly these edifices of thought collapse? This form of defending the faith is not only logically sharp but also biblically clear. You stand on the rock, defend God's truth with conviction and love, and know: “If God is for us, who can be against us?” (Romans 8,31).

We will see that the principle “The Bible alone is God's Word” is not simply a personal religious opinion but a firm foundation for all knowledge. Without this foundation, no human can arrive at real, reliable knowledge. This is no trick and no intellectual circularity but a basic rule of thought: Everyone begins somewhere, but only God's Word is the point at which truth is genuinely securely grounded.

Welcome to solid ground—an invitation to stand in faith

This handbook does not remain in the ivory tower of theological theories but leads directly into the practice of defending faith. It is a practical guide to an invincible defense of faith that shows: Whoever builds on God's revelation stands firm. Whoever builds on human wisdom falls. For:

“Of Solomon. Unless YHWH builds the house, its builders labor in vain; unless YHWH guards the city, the watchman stays awake in vain.” (Psalm 127,1)

I write not from theoretical distance but from years of lived experience in direct Gospel ministry. Countless times I have stood in our cities' great squares, proclaimed the Gospel publicly and deliberately sought open dialogue—not in a sheltered setting but beneath the open sky, before passersby's eyes and ears, amid this world's noise and contradiction.

With a microphone in hand and a second wireless microphone ready, I have actively invited people to ask their questions, voice their doubts and challenge Christian faith. I have experienced the most varied worldviews—naturalism, relativism, skepticism or humanistic arrogance—taking on the unshakable truth of God's Word and collapsing under their own contradiction.

I therefore say not only in theory but from lived reality: The biblical worldview and apologetics resting on God's wisdom revealed there—wisdom from above—are invincible. They not only refute this world's lies but lead people out of darkness into the Gospel's light.

May the reader learn not merely to argue but to know the ground on which they stand. In the beginning was not probability. In the beginning was not an argument: In the beginning was the axiom—the abiding Word of God, Jesus Christ, the true God and eternal life (Jn 1,1-3.14; 1Jn 1,1-3; 5,20).