Over the years, I have had my share of discussions about what we can know about Jesus. I think a good starting place about historical discussions about Jesus is seen in the book The Resurrection of Jesus: A New Historiographical Approach by New Testament historian Mike Licona. In the book Licona discusses what is called “The Historical Bedrock.” These three facts about the Historical Jesus are held by most critical scholars and historians:
1. Jesus’ death by crucifixion
2. Very Shortly after Jesus’ death, the disciples had experiences that led them to believe and proclaim that Jesus had been resurrected and had appeared to them.
3. Within a few years after Jesus death, Paul became a follower of Jesus after a personal experience that he interpreted as a post resurrection appearance of Jesus to him.
In this post, I want to focus on #3. After all, Paul wrote a large majority of the New Testament. Also, his letters are the earliest records we have for Jesus.
Well known New Testament scholar Dr. Bart Ehrman writes the following regarding Paul’s experience:
It is a historical fact that some of Jesus’ followers came to believe that he had been raised from the dead soon after his execution. We know some of these believers by name; one of them, the apostle Paul, claims quite plainly to have seen Jesus alive after his death. Thus, for the historian, Christianity begins after the death of Jesus, not with the resurrection itself, but with the belief in the resurrection” 
Even New Testament scholar Dale Allison even says that Paul converted from a persecutor of the church to one of its greatest promoters because of an experience he perceived was of the risen Jesus appearing to him.  Note: see more below on the issue of whether Paul “converted.”
Some Background on Paul
The undisputed letters of Paul that can be used to give us an understanding about who he was and what his mission was are in Romans, 1 and 2 Corinthians, Galatians, Philippians, 1 Thessalonians, and Philemon. The rest of the letters yield very little about the life of Paul. From Paul’s Letters, we can gather that:
1. The man’s name was Paul: A Greek name.
2. He had a Jewish name, Saul. Remember, having two names was not uncommon for Jews who lived outside Palestine in the first century.
3. Paul was born in Tarsus, a city in Southwestern Asia Minor.
4. He came from a family of Pharisees of the tribe of Benjamin and was named for the tribe’s most illustrious member, King Saul.
5. Paul studied under the famous teacher Gamaliel (Acts 22: 3), the grandson of Hillel. Hillel is known as the Academy of Hillel, founded by a Jewish sage called Hillel the Elder. The House of Hillel was a school of Jewish law and thought that was very well known in the 1st century B.C.E. Jerusalem.
6. Since Paul’s letters show familiarity with rabbinic methods for interpretation of Scripture and popular Hellenistic philosophy to a degree, this makes it likely that he received a formal education in both areas. Hence, Paul’s exegesis of the Old Testament shows evidence of his rabbinic training.
7. Paul was probably, as an adult, a resident of Damascus. 
Paul was an active persecutor of the early Messianic Community:
The language Paul uses in his pre-revelatory encounter with the risen Lord shows how much how antagonistic he was towards the messianic movement. In Gal. 1:13-15, Paul uses terms such as “persecute” and “destroy” to describe his efforts to put an end to the spread of the early faith.
Even though Paul does not give a list of the reasons why he was an ardent persecutor of the early Messianic Movement, this reasons for being a persecutor was probably due to several reasons:
First, Paul may have perceived it to be a threat to Torah obedience. We need to keep in mind that in within the historical background of the first century, if a Jewish person was to deny the Torah as part of their practice, they would be denying the fact that they were Jewish! 
Second, given how he speaks about this topic in his letters (Gal 3:13;1), Paul was most likely aware of Deuteronomy 21:22-23: “If a person commits a sin punishable by death and is executed, and you hang the corpse on a tree, his body must not remain all night on the tree; instead you must make certain you bury him that same day, for the one who is left exposed on a tree is cursed by God. You must not defile your land which the Lord your God is giving you as an inheritance.” The context of this verse is describing the public display of the corpse of an executed criminal. To say that crucifixion was portrayed in a negative light within Judaism in the first century is an understatement. “Anyone hung on a tree is under God’s curse”-the very method of death brought a divine curse upon the crucified. In other words, anyone who was crucified was assumed not to be the Anointed One of God. So Paul most likely found the idea of group of Jewish people following a crucified Messiah to be abhorrent.
Third, given what we see in Acts 8 (following the stoning of Stephen in Acts 7) we see that Paul most likely found the Jesus movement as a threat to the Temple. It says in Acts 8: 1-3,
“Saul was in hearty agreement with putting him to death. And on that day a great persecution began against the church in Jerusalem, and they were all scattered throughout the regions of Judea and Samaria, except the apostles. Some devout men buried Stephen, and made loud lamentation over him. But Saul began ravaging the church, entering house after house, and dragging off men and women, he would put them in prison.”
What Can We Know About Paul’s Revelation of Jesus? A Resurrected Jesus, Or A Subjective Vision?
Jesus was crucified about 33 A.D. According to many scholars, Paul became a follower of Jesus around 35 A.D. Remember, Paul’s letters are dated between AD 40 and 60.
Also, Paul did not follow Jesus from the beginning. However, Paul is still considered an apostle, though “abnormally born” and “the least of the apostles” (1 Corinthians 15:8-9). ). His first years as a follower of Jesus in Arabia remain a mystery. In many places, Paul discusses his Jewish identity. He says “ I am a Jew” (Acts 22;3) “I am a Pharisee” (Acts 23;6), and “I am a prisoner for the sake of the hope of Israel” (Acts 28:20). Notice that Paul didn’t say “I was a Pharisee” or that “I was a Jew.” So perhaps it is inaccurate to say that Paul switched religions. Hence, it would be more reasonable to say that while Paul did have a radical reorientation about his theology, but he more likely received a “call” rather than a conversion to a new religion. If anything, Paul did ‘repent.’ The Hebrew word for repent is “shub” which means to “turn back” or “return.” So Paul was most certainly restored to the God of Israel through the Messiah. But the old saying, “Paul converted to Christianity” (like Ehrman says) has not gone unchallenged within New Testament scholarship.
The Messiah Appeared to Paul
“For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures, that he was buried, that he was raised on the third day according to the Scriptures, and that he appeared to Peter, and then to the Twelve. After that, he appeared to more than five hundred of the brothers at the same time, most of whom are still living, though some have fallen asleep. Then he appeared to James, then to all the apostles, and last of all he appeared to me also, as to one abnormally born.” -1 Cor. 15: 3-8
Let’s go back to Ehrman’s comment:
It is a historical fact that some of Jesus’ followers came to believe that he had been raised from the dead soon after his execution. We know some of these believers by name; one of them, the apostle Paul, claims quite plainly to have seen Jesus alive after his death. Thus, for the historian, Christianity begins after the death of Jesus, not with the resurrection itself, but with the belief in the resurrection.
Last year, Bart Ehrman released another book on Christology. In the book he devotes two chapters to the resurrection. As usual, his hypothesis is that the disciples had visionary experiences. In it he says:
It is undisputable that some of the followers of Jesus came to think that he had been raised from the dead, and that something had to have happened to make them think so. Our earliest records are consistent on this point, and I think they provide us with the historically reliable information in one key aspect: the disciples’ belief in the resurrection was based on visionary experiences. I should stress it was visions, and nothing else, that led to the first disciples to believe in the resurrection. -Bart D. Ehrman, How Jesus Became God: The Exaltation of a Jewish Preacher from Galilee (New York: Harper One, 2014), 183-184.
The good news is that Ehrman goes onto to define what he means by “visions” of Jesus. He describes visions as something that are either “veridical” or “nonveridical.” Veridical visions means people tend to see things that are really there while nonveridical visions the opposite-what a person sees is not based any kind of external reality. It is the latter that leads to what is called the hallucination hypothesis. In other words, skeptics assert that nonveridical visions can be attributed to some sort of psychological explanation. Ehrman then punts to his agnosticism again and says he doesn’t care if the appearances can be attributed to either “veridical” or “nonveridical” visionary experiences or anything else.
So let’s look at the appearance of Jesus to Paul:
Gerd Lüdemann says:
“At the heart of the Christian religion lies a vision described in Greek by Paul as ōphthē—“he was seen.” And Paul himself, who claims to have witnessed an appearance asserted repeatedly “I have seen the Lord.” So Paul is the main source of the thesis that a vision is the origin of the belief in resurrection….When we talk about visions, we must include something that we experience every night when we dream. That’s our subconscious was of dealing with reality.” (7)
The problem with Lüdemann’s comment is that he doesn’t expand enough on how ōphthē is used. Hence, ōphthē isn’t restricted to describing something that is only visionary, spiritual, or physical.
Furthermore, given Paul had discussed his personal visions in 2 Cor. 12:1 and other places, he knew the difference between an internal vision and an external appearance.
1 Corinthians 9
Am I not free? Am I not an apostle? Have I not seen Jesus our Lord? Are not you my workmanship in the Lord? If to others I am not an apostle, at least I am to you, for you are the seal of my apostleship in the Lord.” 1 Corinthians 9: 1-2
Here we see that Paul is using “seen” (ὁράω) “horáō” which in the passive form of (ōphthē) entails ” to see with the eyes,” “to see with the mind, to perceive, know,” “to see” (i.e. become acquainted with by experience, to experience), “to see, to look to” or “I was seen, showed myself, appeared.”
“In this connection I journeyed to Damascus with the authority and commission of the chief priests. At midday, O king, I saw on the way a light from heaven, brighter than the sun, that shone around me and those who journeyed with me. And when we had all fallen to the ground, I heard a voice saying to me in the Hebrew language,‘Saul, Saul, why are you persecuting me? It is hard for you to kick against the goads.’ And I said, ‘Who are you, Lord?’ And the Lord said, ‘I am Jesus whom you are persecuting. But rise and stand upon your feet, for I have appeared to you for this purpose, to appoint you as a servant and witness to the things in which you have seen me and to those in which I will appear to you, delivering you from your people and from the Gentiles—to whom I am sending you to open their eyes, so that they may turn from darkness to light and from the power of Satan to God, that they may receive forgiveness of sins and a place among those who are sanctified by faith in me.’ “Therefore, O King Agrippa, I was not disobedient to the heavenly vision, but declared first to those in Damascus, then in Jerusalem and throughout all the region of Judea, and also to the Gentiles, that they should repent and turn to God, performing deeds in keeping with their repentance.”- Acts 26: 12-20.
Sometimes, people point out Acts 26: 19, where Paul says: “Therefore, O King Agrippa, I was not disobedient to the heavenly vision (ὀπτασία) “optasía” but declared first to those in Damascus, then in Jerusalem and throughout all the region of Judea, and also to the Gentiles, that they should repent and turn to God, performing deeds in keeping with their repentance. ”
However, a look at the entire context of this chapter shows that the vision here could refer to the time when Ananias received the information about Paul’s commission to minister to the Gentiles (Acts 9: 10-19). Paul did not receive his specific missionary mandate from his Damascus road experience (Acts 9: 1-9). Rather, he was told “to go into the city, and you will be told what you must do” (v. 5) where the “vision” (v. 10) came to Ananias that Paul was given his missionary mandate “to carry my [Christ’s] name before the Gentiles” (9: 15). Therefore, when Paul said “I was not disobedient to the heavenly vision” (Acts 26: 19), it is possible it was to the commission he was given through Ananias’s vision that Paul is referring to.
Acts 9: Paul’s Damascus Road Experience
Here we see whatever happened, this was after the ascension. Hence, to say Paul saw the exact same Jesus before he ascended is hard to infer from the text. There simply isn’t enough information here. The Bible says, “they heard” the same voice Paul did ” (Acts 9: 7). But they “did not see anyone ” (Acts 9: 7). Notice Paul was physically blinded by the brightness of the light. One way or the other, the experience involved something that was external to Paul. It wasn’t something that was the same thing as a vision that Paul talks about in 2 Cor. 12:1. Furthermore, the phrase “he let himself be seen’” (ōphthē , aorist passive, ), is the word Paul uses in 1 Cor. 15:7 to describe of his own resurrection appearance as the other ones in the creed. As Paul Barnett says:
“It is sometimes claimed that the word appeared (ōphthē) means a mystical seeing, as of a vision, and that since this was what Paul “saw” it was what the other apostles “saw.” In other words, after death, Jesus was taken directly to heaven whence he “appeared” to various people, mystically, as it were. This however, is not all the meaning of Paul’s words. First, the word ōphthē, “appeared” is not limited to visionary seeing it is also used for physical seeing. Moreover, the verb raise used in the phrase ‘raised on the third day” is used elsewhere in combination with the words “from the dead” which literally means “from among the corpses.” Thus raised preceding appeared gives the latter a physical not a mystical meaning. Christ, as “raised from the dead” ….appeared.” Furthermore, when Paul asks “ Am I not free? Am I not an apostle? Have I not seen Jesus our Lord?”(1 Cor. 9: 1), he is using the ordinary word horan, “to see” for physical sight. If “seeing” the Lord “raised from the dead” qualified others to be apostles, then Paul is, indeed, an apostle. It was no mere subjective vision that arrested Paul en route to Damascus. (8) .
In the end, word studies can’t entirely resolve this issue. We need to remember the etymological fallacy as well. We would have to look at all the texts that speak of resurrection (including the entire 1 Cor. 15 chapter in their entire context as well as the anthropology of the New Testament. We also need to study the resurrection in light of the Second Temple Jewish period. See our reading list here for some resources that may help.
What About Galatians 1:11-12?
When we come to Galatians 1:11-12, Paul defends his ministry by discussing the manner of how he received the Gospel:
“ For I would have you know, brethren, that the gospel which was preached by me is not according to man. For I neither received it from man, nor was I taught it, but I received it through a revelation of Jesus Christ.” (Galatians 1:11-12).
Let’s look at 1 Corinthians 15: 3-5:
“For I delivered to you as of first importance what I also received, that Christ died for our sins according to the Scriptures and that He was buried, and that He was raised on the third day according to the Scriptures, and that He appeared to Cephas, then to the twelve.”
So what is the truth? Paul says in Galatians that he received it by divine revelation. But what about the creed in 1 Corinthians 15? How do we respond to this? First, while we always need to look at the context of where the word “received” is used, in both 1 Cor. 15:3 and Galatians 1:12, the word “received” (“παραλαμβάνω”) means to receive something transmitted from someone else, which could be by an oral transmission or from others from whom the tradition proceeds. In other words, according to Paul, he did not create the Gospel story. It was something he received from another source.
So in this case, what is helpful here is to differentiate between essence and form. The essence of the gospel, that Jesus of Nazareth was truly the Son of God, was revealed to Paul (he received it) on the life changing moment on the Damascus road. Paul realized that the Christians that he had been persecuting had been right all along about Jesus being the Messiah.
As far as the form the gospel, this includes the historical undergirding of certain events, certain phraseology used to express the new truth and doubtless many other things that were passed onto Paul by those other than him (see Carson, Moo, Morris, An Introduction To The New Testament Survey, pg 220).
Remember, Paul also employs oral tradition terminology such as “delivering,” “receiving,” “passing on” “learning,” “guarding,” the traditional teaching within his letters in the following places:
Romans 16: 17: “Now I urge you, brethren, keep your eye on those who cause dissensions and hindrances contrary to the teaching which you learned, and turn away from them.”
1 Corinthians 11:23: For I received from the Lord that which I also delivered to you, that the Lord Jesus in the night in which He was betrayed took bread.
Philippians 4:9: The things you have learned and received and heard and seen in me, practice these things, and the God of peace will be with you.
1 Thessalonians 2:13: For this reason we also constantly thank God that when you received the word of God which you heard from us, you accepted it not as the word of men, but for what it really is, the word of God, which also performs its work in you who believe.
2 Thessalonians 2:15: So then, brethren, stand firm and hold to the traditionswhich you were taught, whether by word of mouth or by letter from us.
Paul’s usage of the rabbinic terminology “passed on” and “received” is seen in the creed of 1 Cor. 15:3-5. This entails that Paul received this information from someone else at an even earlier date. The majority of scholars who comment think that Paul probably received this information about three years after his conversion, which probably occurred from one to four years after the crucifixion. At that time, Paul visited Jerusalem to speak with Peter and James, each of whom are included in the list of Jesus’ appearances (1 Cor. 15:5, 7; Gal. 1:18–19).This places it at roughly A.D. 32–38. Even the co-founder Jesus Seminar member John Dominic Crossan, writes:
“Paul wrote to the Corinthians from Ephesus in the early 50s C.E. But he says in 1 Corinthians 15:3 that “I handed on to you as of first importance which I in turn received.” The most likely source and time for his reception of that tradition would have been Jerusalem in the early 30s when, according to Galatians 1:18, he “went up to Jerusalem to visit Cephas [Peter] and stayed with him fifteen days” (9)
Conversion Disorders and Hallucinations: Note: To see a critique of these options for what happened to Paul, see The Resurrection of Jesus: a Clinical Review of Psychiatric Hypotheses for the Biblical Story of Easter Joseph W. Bergeron, M.D. and Gary R. Habermas, Ph.D
In the end, it is clear that Paul had a dramatic change that turned him from a persecutor of the early followers of Jesus to the greatest missionary of the early faith. Someone may object and say it is not a big deal for someone to make such a radical change in their beliefs in antiquity. After all, people change beliefs all the time (i.e. people leave Islam for the Christian faith or vice versa). In response, I suggest doing a thorough study of the honor and shame culture that Paul was acquainted with. You will see it was much more of a challenge to change one’s beliefs in antiquity than it is today. I submit that the bodily resurrection of Jesus is the best explanation for the change in Paul’s life.
1. Michael R. Licona, The Resurrection of Jesus: A New Historiographal Approach (Downers Grove, ILL: Intervarsity Press, 2010).
3. Bart Ehrman, The New Testament: A Historical Introduction to the Early Christian Writings. Third Edition (New York, Oxford: Oxford University Press, 2004), 276.
4. Dale Allison, Resurrecting Jesus: The Earliest Christian Tradition and Its Interpreters (New York: T&T Clark, 2005), 263-268.
5. Most of points 1-8 are laid out in Marion Soard’s The Apostle Paul: An Introduction to his Writings and Teaching (Mahwah, New Jersey: Paulist Press, 1987), 10-11.
6. See Martin Hengel’s The Pre-Christian Paul (Philadelphia: Trinity Press International, 1991).
7. Gerd Lüdemann, The Resurrection of Jesus: History, Experience, Theology. Translated by John Bowden. London: SCM, 1994 (1994), 97, 100.
8. Paul Barnett, Jesus and the Rise of Early Christianity (Downers Grove, Intervarsity. 1999), 183-184.
9. J.D. Crossan & Jonathan L. Reed. Excavating Jesus: Beneath the Stones, Behind the Texts (New York: HarperSanFrancisco, A Division of HarperCollins Publishers, 2001) 254.