An Apologetic for Apologetics

By: Dr. Norman Geisler; ©2012
Christianity is under attack today, and it must be defended. There are attacks from within by cults, sects, and heresies. And there are attacks from without by atheists, skeptics, and other religions. The discipline that deals with a rational defense of the Christian Faith is called apologetics.


Christianity is under attack today, and it must be defended. There are attacks from within by cults, sects, and heresies. And there are attacks from without by atheists, skeptics, and other religions. The discipline that deals with a rational defense of the Christian Faith is called apologetics. It comes from the Greek word apologia (cf. 1 Peter 3:15) which means to give a reason or defense.

I. Objections to Defending the Faith: Biblical and Extra-Biblical

Many objections have been offered against doing apologetics.  Some offer an attempted biblical justification.  Others are based in extra-biblical reasoning.  First, let’s take a look at those based on biblical texts.

A. Objections to Apologetics from Within the Bible

1. The Bible Does Not Need to Be Defended

One objection to apologetics often made is the claim that the Bible does not need to be defended; it simply needs to be expounded. Hebrews 4:12 is often cited as evidence: “The Word of God is alive and powerful…” (NIV).  It is said that the Bible is like a lion; it does not need to be defended but simply let loose. A lion can defend itself. Several things should be noted in response.

First, this begs the question as to whether or not the Bible is the Word of God. Of course, God’s Word is ultimate, and it speaks for itself. But how do we know the Bible is the Word of God, as opposed to the Qur’an, the Book of Mormon, or some other book? One must appeal to evidence to determine which of the many conflicting books really is the Word of God.

Second, no Christian would accept the claim of a Muslim without question that “the Qur’an is alive and powerful and sharper than a two-edged sword….” We would demand evidence.  Likewise, no non-Christian should accept our claim without evidence.

Third, the analogy of the lion is misleading. A roar of a lion speaks with authority only because we know from previous knowledge what a lion can do. Without the tales of woe about a lion’s ferocity, its roar would not have the same authoritative effect on us. Likewise, without evidence to establish one’s claim to authority, there is no good reason to accept that authority.

2. Jesus Refused to do Signs for Evil Men

Some argue that Jesus rebuked people who sought signs. Hence, we should be content simply to believe without evidence. Indeed, Jesus did on occasion rebuke sign seekers. He said, “A wicked and adulterous generation asks for a miraculous sign!” (Matt. 12:39, cf. Luke 16:31). However, this does not mean that Jesus did not desire people to look at the evidence before they believed for many reasons.

First, even in this very passage Jesus went on to offer the miracle of His resurrection as a sign of who He was, saying, “But none will be given it except the sign of the prophet Jonah (Matt. 12:39-40).  Likewise, Paul gave many evidences for the resurrection (in 1 Cor. 15).  And Luke speaks of “many convincing proofs” (Acts 1:3) of the resurrection.

Second, when John the Baptist inquired whether He was the Christ, Jesus offered miracles as proof, saying: “Go back and report to John what you hear and see: The blind receive sight, the lame walk, those who have leprosy are cured, the deaf hear, the dead are raised, and the good news is preached to the poor” (Matt. 11:5). When replying to the Scribes, He said: “‘But that you may know that the Son of Man has authority on earth to forgive sins.’ He said to the paralytic, ‘I tell you, get up, take your mat and go home’” (Mark 2:10-11). Nicodemus said to Jesus, “Rabbi, we know you are a teacher who has come from God. For no one could perform the miraculous signs you are doing if God were not with him” (John 3:2).

Third, Jesus was opposed to sign-seeking or entertaining people by miracles. Indeed, He refused to perform a miracle to satisfy King Herod’s curiosity (Luke 23:8).  On other occasions He did not do miracles because of their unbelief (Matt. 13:58), not wishing to “cast pearls before swine.” The purpose of Jesus’ miracles was apologetic, namely, to confirm His message (cf. Ex. 4:1f; Jn. 3:2; Heb. 2:3-4). This He did in great abundance, for “Jesus of Nazareth was a man accredited by God to you by miracles, wonders and signs, which God did among you through him…” (Acts 2:22).

3. Paul Was Unsuccessful In His Use of Reason on Mars Hill and Later Discarded the Approach

Opponents of apologetics sometimes argue that Paul was unsuccessful in his attempt to reach the thinkers on Mars Hill (Acts 17), discarding the method and later telling the Corinthians that he wanted to “know Jesus and Him only” (1 Cor. 2:2). However, this interpretation is based on a misunderstanding of the text.

For one thing, Paul did have results on Mars Hill. For some people were saved, including a philosopher. The text says clearly “A few men became followers of Paul and believed. Among them was Dionysius, a member of the Areopagus, also a woman named Damaris, and a number of others” (Acts 17:34).

Second, nowhere in either Acts or 1 Corinthians does Paul indicate any repentance or even regret over what he did on Mars Hill. This is reading into the text what simply is not there.

Third, Paul’s statement about preaching Jesus and Jesus only is not a change in the content of Paul’s preaching. This is what he did everywhere. Even to the philosophers “he preached Jesus and the resurrection” (Acts 17:18, cf. v. 31). So there was nothing unique about what he preached; it was simply how he did it. Paul tailored his starting point to where the audience was. With the heathen at Lystra he began by an appeal to nature (Acts 14) and ended by preaching Jesus to them. With the Jews he began with the OT and moved on to Christ (Acts 17:2-3). But with the Greek thinkers Paul began with creation and reason to a Creator and on to His Son Jesus who died and rose again (Acts 17:24f).

4. Only Faith, not Reason, Can Please God

Heb. 11:6 insists that “without faith it is impossible to please God.” This would seem to argue against the need for reason. In fact, it would appear that asking for reasons, rather than simply believing, would displease God. In response to this argument against apologetics two important points must be made.

First of all, the text does not say that with reason it is impossible to please God. It says without faith one cannot please God. It does not eliminate reason accompanying faith or a reasonable faith.

Second, God in fact calls upon us to use our reason (1 Pet. 3:15). Indeed, He has given “clear” (Rom. 1:20) and “convincing proofs” (Acts 1:3 NASB) so that we do not have to exercise blind faith.

Third, this text in Hebrews does not exclude “evidence” but actually implies it. For faith is said to be “the evidence” of things we do not see (Heb. 11:1 NKJV). For example, the evidence that someone is a reliable witness justifies my believing his testimony of what he saw and I did not. Even so, our faith in “things not seen” (Heb. 11:1 NKJV) is justified by the evidence we have that God does exist which is “clearly seen, being understood from what has been made” (Rom. 1:20).

5. Paul Said God Can’t be Known by Human Reason when He Wrote, “the world by wisdom knew not God” (1 Cor. 1:21 NKJV).

However, this cannot mean that there is no evidence for God’s existence, since Paul declared in Romans that the evidence for God’s existence is so “plain” as to render even the heathen “without excuse” (Rom. 1:19-20). Further, the context in 1 Corinthians is not God’s existence but His plan of salvation through the cross. This cannot be known by mere human reason but only by divine revelation. It is “foolish” to the depraved human mind.

What is more, the “wisdom” of which he speaks is “the wisdom of this world” (v. 20), not the wisdom of God. Paul called a sophist the “disputer of this age” (v. 20). Sophist could argue for argument’s sake. This leads no one to God. Further, Paul’s reference to the world by wisdom not knowing God is not a reference to the inability of human beings to know God through the evidence He has revealed in creation (Rom. 1:19-20) and conscience (Rom. 2:12-15). Rather, it is a reference to man’s depraved and foolish rejection of the message of the cross.

Finally, in this very book of 1 Corinthians Paul gives his greatest apologetic evidence for the Christian Faith—the eyewitnesses of the resurrection of Christ which his companion Luke called “many convincing proofs” (Acts 1:3 NASB). Indeed, even though man knows clearly through human reason that God exists, nevertheless, he “suppresses” or “holds down” this truth in unrighteousness (Rom. 1:18).  Thus, it is the presence of such strong evidence that leaves him “without excuse” (Rom. 1:20).

6. The Natural Man Can’t Understand Spiritual Truths

Paul insisted that “the man without the Spirit does not accept the things that come from the Spirit of God…” (1 Cor. 2:14). They cannot even “know” them. What use, then, is apologetics? In response to this argument against apologetics two things should be observed.

First, Paul does not say that natural persons cannot perceive truth about God, but only that they do not receive it (Gk: dekomai, welcome). Indeed, Paul emphatically declared that the basic truths about God are “clearly seen” (Rom. 1:20). The problem is not that unbelievers are not aware of God’s existence but that they do not want to accept Him because of the moral consequences this would have on their sinful lives.

Second, 1 Cor. 2:14 says they do not “know” (Gk: ginosko) which can mean to know by experience. In other words, they know God in their mind (Rom. 1:19-20) but they have not accepted Him in their heart (Rom. 1:18). The Bible says, “The fool has said in his heart, ‘There is no God’” (Psa. 14:1).

7. Only the Holy Spirit Can Bring Someone to Christ

The Bible says that salvation is a work of the Holy Spirit. He alone can convict, convince, and convert (John 16:8; Eph. 2:1; Titus 3:5-7). This is certainly true, and no orthodox Christian denies this. However, two things must be kept in mind. First, the Bible does not teach that the Holy Spirit will always do this apart from reason and evidence. It is not either the Holy Spirit or Reason. Rather, it is the reasonable Holy Spirit using good reason to reach rational people.  God is always the efficient cause of salvation, but apologetic arguments can be an instrumental cause used by the Holy Spirit to bring one to Christ.

Second, apologists do not believe that apologetics saves anyone. It only provides evidence in the light of which people can make rational decisions. It only provides evidence that Christianity is true. One must still place his faith in Christ in order to be saved. Apologetics only leads the “horse” to the water. Only the Holy Spirit can persuade him drink.

8. Apologetics is not Used in the Bible

It is objected that if apologetics is biblical, then why don’t we see it done in the Bible? There are two basic reasons for this misunderstanding. First, by and large the Bible was not written for unbelievers but for believers. Since they already believe in God, Christ, etc., they are already convinced these are true. Hence, apologetics is directed primarily for those who do not believe so that they may have a reason to believe.

Second, contrary to the claim of critics, apologetics is used in the Bible. 1) The first chapter of Genesis confronts the mythical accounts of creation known in that day. 2) Moses’ miracles in Egypt were an apologetic that God was speaking through him (Ex. 4:1-9). 3) Elijah did apologetics on Mt. Carmel when he proved miraculously that Yahweh is the true God, not Baal (1 Kings 18). 4) As we have shown in detail elsewhere, Jesus was constantly engaged in apologetics, proving by signs and wonders that He was the Son of God (John 3:2; Acts 2:22). 5) The Apostle Paul did apologetics at Lystra when he gave evidence from nature to the heathen that the supreme God of the universe existed and that idolatry was wrong (Acts 14). 6) The classic case of apologetics in the NT is Acts 17 where Paul reasoned with the philosophers on Mars Hill. He not only presented evidence from nature that God existed but also from history that Christ was the Son of God. Indeed, he cited pagan thinkers in support of his arguments.

B. Objections to Apologetics from Outside the Bible

These objections against apologetics are geared to show either its irrationality, inadequacy, or fruitlessness. Many come from a rationalistic or skeptical point of view. Others are fideistic which denies reason should be used to support ones faith.

1. Human Reason Can’t Tell Us Anything About God. Some critics assert that human reason cannot give us any information about God.

First, it says that reason doesn’t apply to questions about God. But this statement itself is offered as a reasonable statement about the issue of God. In order to say that reason doesn’t apply to God, one has to apply reason to God in that very statement. So reasoning about God is inescapable. Reason cannot be denied without being employed. Second, purely hypothetical reason itself does not tell us anything exists, including God.  But since something undeniably exists (e.g., I do), then reason can tell us much about existence, including God.  For instance, if something finite and contingent exists, then something infinite and necessary must exist (i.e., God).  And if God exists, then it is false that He does not exist. And if God is a necessary Being, then He cannot not exist. Further, if God is Creator and we are creatures, then we are not God. Likewise, reason informs us that if God is omnipotent, then He cannot make a stone so heavy that He cannot lift it. For whatever He can make, He can lift.

2. Reason is Useless in Religious Matters

Fideism argues that reason is of no use in matters that deal with God. One must simply believe. Faith, not reason, is what God requires (Heb. 11:6). In response to this several points can be made. First, even from a biblical point of view God calls on us to use our reason (Isa. 1:18; 1 Pet. 3:15; Matt. 22:36-37). God is a rational being, and He created us as rational beings. God would not insult the reason He gave us by asking us to ignore it in such important matters as our beliefs about Him.

Second, this position is fideistic and is self-defeating. For either it has a reason that we should not reason about God or it does not. If it does, then it defeats itself by using reason to say we should not use reason. If fideism has no reason for not using reason, then it is without reason for its position, in which case there is no reason why one should accept fideism.

Furthermore, to claim reason is just optional for a fideist will not suffice. For either the fideist offers some criteria for when we should be reasonable and when we should not, or else his view is simply arbitrary. If he offers some rational criteria for when we should be rational, then he does have a rational basis for his view, in which case he is not really a fideist after all. Reason is not the kind of thing in which a rational creature can choose to participate. By virtue of being rational by nature one must be part of rational discourse. And rational discourse demands that one follow the laws of reason.

A major contribution made by the late Francis Schaeffer was his emphasis on the need for a reasoned approach to apologetics.  In his Escape from Reason he showed the futility of those who attempt to reject reason.  He constantly chided those who make a “dichotomy between reason and non-reason.” He also criticizes those who forsake reason for a  “lower story” materialism or an “upper story” mysticism.

3. You Can’t Prove God or Christianity by Reason

According to this objection, the existence of God cannot be proven by human reason. The answer depends on what is meant by “prove.”

First, if “prove” means to demonstrate with mathematical certainty, then most theists would agree that God’s existence cannot be proven in this way. The reason for this is because mathematical certainty deals only with the abstract, and the existence of God (or anything else) is a matter of concrete, real existence.  Mathematical certainty is based on certain axioms or postulates that must be assumed in order to get a necessary conclusion. But if God’s existence must be assumed in order to be proven, then the conclusion that God exists is only based on the assumption that He exists, in which case it is not really a proof at all. Mathematical certainty is deductive in nature. It argues from given premises. But one cannot validly conclude what is not already implied in the premise(s). In this case one would have to assume God exists in the premise in order to validly infer this in the conclusion. But this begs the question.

Second, if by “prove,” however, we mean “give adequate evidence for” or “provide good reasons for,” then it would seem to follow that one can prove the existence of God and the truth of Christianity. Indeed, many apologists have offered such proofs and people have become Christians after reading their writings.

4. No One is Persuaded of Religious Truths by Reason

According to this argument, no one is ever persuaded to accept a religious truth by reason. Psychological, personal, and subjective factors prompt religious decisions, not rational arguments. But this objection is patently false for many reasons. First of all, who ever became a believer because he thought it was irrational and absurd to do so. Certainly, the vast majority of people who believe in God or accept Christ do so because they think it is reasonable.

Second, this objection confuses two kinds of belief: belief in and belief that. Certainly, religious belief in God and in Christ is not based on evidence and reason. But neither is it done without them. Every rational person looks to see if there is evidence that the elevator has a floor before he steps in it. Likewise, all rational people want evidence that an airplane can fly before they get in it. So belief that is prior to belief in. Apologetics deals with the former. It provides evidence that God exists, that Christ is the Son of God, and that the Bible is the Word of God. A religious decision is a step of faith in the light of the evidence, not a leap of faith in the dark—in the absence of evidence.

II. The Reasons for the Need to Defend the Faith

There are many good reasons for doing apologetics.  First of all, God commands us to do so.  Second, reason demands it.  Third, the world needs it.  Fourth, results confirm it.

A. God Commands the Use of Reason

The most important reason for doing apologetics is that God told us to do it. Over and over the New Testament exhorts us to defend the Faith.  1 Peter 3:15 says, “But in your hearts acknowledge Christ as the holy Lord. Always be prepared to give an answer to every one who asks you to give the reason for the hope that you have.” This verse says several important things.

First, it says that we should be ready. We may never run across someone who asks the tough questions about our faith, but we should still be ready just in case. But being ready is not just a matter of having the right information available, it is also an attitude of readiness and eagerness to share with others the truth of what we believe.

Second, we are to give a reason to those who ask the questions (cf. Col. 4:5-6). It is not expected that every one needs pre-evangelism, but when they do need it, we must be able and willing to give them an answer.

Finally, it links doing pre-evangelism with making Christ Lord in our hearts. If He is really Lord, then we should be obedient to Him by “destroying speculations and every lofty thing raised up against the knowledge of God, and … taking every thought captive to the obedience of Christ” (2 Cor. 10:5). In other words we should be confronting issues in our own minds and in the expressed thoughts of others that are preventing them from knowing God. That is what apologetics is all about.

In Philippians 1:7 speaks of his mission as one of “defending and confirming the gospel.” He added in verse 16, “I am put here for the defense of the gospel” (Phil 1:16). And we are put where we are to defend it as well.

Jude 3 declares: “Beloved, while making every effort to write to you about our common salvation, I felt it necessary to write to you appealing that you contend earnestly for the faith once for all given over to the saints.” The people Jude was writing to had been assaulted by false teachers and he needed to encourage them to protect (literally agonize for) the faith as it had been revealed through Christ. Jude makes a significant statement about our attitude as we do this in verse 22 when he says, “have mercy on some, who are doubting.” Apologetics, then, is a form of compassion.

Titus 1:9 makes knowledge of Christian evidences a requirement for church leadership. An elder in the church should be “holding fast the faithful word which is in accordance with the teaching, that he may be able both to exhort in sound doctrine and to refute those who contradict.”

In 2 Timothy 2:24-25 Paul declares that “the Lord’s bondservant must not be quarrelsome, but be kind to all, able to teach, patient when wronged, with gentleness correcting those who are in opposition, if perhaps God may grant them repentance leading to the knowledge of the truth.” Anyone attempting to answer the questions of unbelievers will surely be wronged and be tempted to lose patience, but our ultimate goal is that they might come to a knowledge of the truth that Jesus has died for their sins.

Indeed, the command to use reason is part of the greatest command. For Jesus said, “`Love the Lord your God with all your heart and with all your soul and with all your mind.’ This is the first and greatest commandment” (Matt. 22:37-38).

B. Reason Demands It

God created us with human reason. It is part of His image in us (Gen. 1:27 cf. Col. 3:10). Indeed, it is that by which we are distinguished from “brute beasts” (Jude 10). God calls upon us to use our reason (Isa. 1:18) to discern truth from error (1 John 4:6); to determine  right from wrong (Heb. 5:14), and to discern a true from a false prophet (Deut. 18:19-22).

A fundamental principle of reason is that we should have sufficient grounds for what we believe. An unjustified belief is just that–unjustified. Being created rational creatures and not “unreasoning animals” (Jude 10 NASB), we are expected to use the reason God gave us.  Socrates said, “The unexamined life is not worth living.” Likewise, the unexamined faith is not worth having. Therefore, it is incumbent upon Christians “to give a reason for their hope” (1 Pet. 3:15). This is part of the great command to love God with all our mind, as well as our heart and soul (Matt. 22:36-37).

C. The World Needs It

Many people refuse to believe without some evidence, as indeed they should. Since God created us as rational beings He does to expect us to live irrationally. He wants us to look before we leap.  This does not mean there is no room for faith. But God wants us to take a step of faith in the light—in the light of evidence. He does not want us to leap in the dark.

We should have evidence that something is true before we place our faith in it. For example, no rational person steps in an elevator unless he has some reason to believe it will hold him up. Likewise, no reasonable person gets on an airplane that has a broken wing and smoke coming out the tail end. Belief that is prior to belief in. Evidence and reason is important to establish belief that. Once this is established, one can place his faith in it.  Thus, the rational person will want some evidence that God exists before he places his faith in God. Likewise, rational unbelievers will want evidence for the claim that Jesus is the Son of God before they place their trust in Him.

D. Results Confirm It

There is a common misnomer among many Christians that apologetics never helps to bring anyone to Christ. This is a serious misrepresentation of the facts.

1. The Conversion of St. Augustine

There were several significant rational turning points in Augustine’s life before he came to Christ. First, he reasoned his way out of Manichaean dualism. One significant turning point here was the success of a young Christian debater of Manicheans called Helpidius. Second, Augustine reasoned his way out of total skepticism by seeing the self-defeating nature of it. Third, were it not for studying Plotinus, Augustine informs us that he would not even been able to conceive of a spiritual being, let alone believe in one.

2. The Conversion of Frank Morison

This skeptical attorney set out to disprove Christianity by showing the resurrection never occurred. The quest ended with his conversion and a book titled Who Moved the Stone? in which the first chapter was titled “The Book That Refused to be Written”!  More recently another unbelieving attorney had a similar journey.

3. The Conversion of Simon Greenleaf

At the turn of the century the Professor of Law at Harvard, who wrote the book on legal evidence, was challenged by students to apply the rules of legal evidence to the New Testament to see if its testimony would stand up in court. The result was a book titled The Testimony of the Evangelists in which he expresses his confidence in the basic documents and truths of the Christian Faith.

4. The Results of Debates

Many people have been led toward or to Christianity as a result of debates we have had with atheists and skeptics. After debating Berkley University philosopher Michael Scriven on “Is Christianity Credible?” the University of Calgary audience voted three to one in favor of Christianity. The campus newspaper report read: “Atheist Fails to Convert Campus Christians!”  Following a debate on the rationality of belief in Christianity with the head of the philosophy department at the University of Miami, the Christian student leadership held a follow-up meeting. The atheist professor attended and expressed doubts about his view expressed at the debate. It was reported that some 14 people who had attended the debate made decisions for Christ.

After a debate on the Moonie religion at Northwestern University in Evanston, Illinois, a Moonie girl asked some questions about Christianity. I could see that she had been convinced that the Unification Church was not teaching the truth. After talking with her briefly, I introduced her to a female seminary student who led her to Christ. When sharing the gospel with Don Bly, he informed us that he was an atheist. After reasoning with him from atheism to open-minded agnosticism, he agreed to read Frank Morison’s book. The evidence for Christ’s resurrection convinced him and we had the privilege of leading him to Christ. He has subsequently raised his family for Christ became a leader in a church south of St. Louis.

5. The Results of Reading Apologetic Writings

I have received a number of letters and reports of people who have been converted to belief that God exists or to belief in Christ after reading apologetics works. God used its arguments as an instrument to bring people toward and to Christ. The world’s most notorious atheist wrote, “Nor do I claim to have had any personal experience of God or any experience that may be called supernatural or miraculous.  In short, my discovery of the divine has been a pilgrimage of reason and not of faith.”

Noted former atheist Francis Collins said, “After twenty eight years as a believer, the Moral Law still stands out for me as the strongest signpost to God.  More than that, it points to a God who cares about human beings, and a God who is infinitely good and holy.”

A college student wrote, “God sent me your book ‘I Don’t Have Enough Faith to Be an Atheist’….  I opened the book thinking I would rip it apart with my superior viewpoint and about one quarter of the way through I ended up apologizing to God and accepting him into my heart.  I have since grown exponentially in Christ, and I thought I would thank you for your inspiring book.”

“I just got done reading Why I Am a Christian, and I was blown away.  It is perhaps the most powerful and influential Christian book I’ve ever read.  It was exactly what I was looking for.  It provided the answers to the roadblocks that were guarding against my faith…. Your book pressed the red button setting off the nuclear bomb of my faith.”


Christianity is under attack today and must be defended against attacks from within by cults and heresies and from without by skeptics and other religions.  We have a reasonable Faith, and the Bible has commanded that we give reasons for it. As perhaps the greatest apologist of the twentieth century, C. S. Lewis, said: “To be ignorant and simple now—not to be able to meet the enemies on their ground—would be to throw down our weapons, and to betray our uneducated brethren who have, under God, no defense but us against the intellectual attacks of the heathen. Good philosophy must exist, if for no other reason, because bad philosophy needs to be answered.” The reason we need to defend the true religion is because there are false religions. The reason we need to stand for authentic Christianity is that there are counterfeit forms of Christianity.

*This article is a revision of a previously unpublished article called “The Need for Apologetics.”

**Unless otherwise noted, all quotations from the Bible are taken from the New International Version of the Bible (NIV).


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Geisler, Norman L., Christian Apologetics

Geisler, Norman L. and Ronald Brooks, When Skeptics Ask

Kreeft, Peter and Ronald K. Tacelli, Handbook of Christian Apologetics

Lewis, Gordon R., Testing Christianity’s Truth Claims

McDowell, Josh, Evidence That Demands A Verdict

Montgomery, John W., Faith Founded on Fact

Moreland, J. P., Scaling the Secular City

Smith, Wilbur M., Therefore Stand

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