SAYINGS OF JESUS VS. STORIES ABOUT JESUS
The Gospel of Luke has something significant to offer scholars who study the historical Jesus, at least in terms of the sayings, parables, and teachings of Jesus. The main reason for this is that whenever a saying, parable, or teaching of Jesus is found in both the Gospel of Matthew and in the Gospel of Luke but NOT in the Gospel of Mark, that saying, parable, or teaching probably came from an early source of the words and teachings of Jesus known as Q.[1] Without the Gospel of Luke, it would be very difficult to determine the content of this early source of the sayings, parables, and teachings of Jesus.
However, the stories about Jesus found in the Gospel of Luke might not provide historically reliable information about the life, ministry, and death of Jesus. For example, if the stories about Jesus in the Gospel of Mark are historically unreliable, then most of the stories about Jesus in the Gospel of Luke are also historically unreliable, because most of the stories about Jesus in the Gospel of Luke came from the Gospel of Mark.[2]
On the other hand, if the stories about Jesus in the Gospel of Mark are historically reliable, then most of the stories about Jesus in the Gospel of Luke would also be historically reliable, because most of the stories about Jesus in the Gospel of Luke came from the Gospel of Mark.
CHANGES & ADDITIONS TO STORIES FROM THE GOSPEL OF MARK
However, the author of the Gospel of Luke did make some changes to the stories about Jesus that came from the Gospel of Mark, and did add some stories or events to what is found in the Gospel of Mark. The changes and additions by the author of the Gospel of Luke to stories about Jesus from the Gospel of Mark could either be historically reliable or not. If those changes and additions are historically unreliable, then in terms of stories about Jesus, the Gospel of Luke would have very little historical information to offer about Jesus beyond what we already find in the Gospel of Mark.
REASONS FOR THE HISTORICAL UNRELIABILITY OF THE GOSPEL OF LUKE
In this post (and future posts in this series), I am going to argue that the changes and additions to the stories about Jesus from the Gospel of Mark made by the author of the Gospel of Luke are dubious and historically unreliable. There are at least five reasons that support this conclusion:
REASON #1: There are several general considerations about the Gospel of Luke that suggest that its additions and changes to stories from the Gospel of Mark are historically unreliable. I will present such general considerations later in this post.
REASON #2: The Gospel of Mark has no stories about the birth, infancy, or childhood of Jesus, but the Gospel of Luke adds stories of eight such events, and there are good reasons to doubt the historical reliability of those stories in the Gospel of Luke.
REASON #3: The Gospel of Mark has no stories about alleged appearances of the risen Jesus to his followers, but the Gospel of Luke adds stories about three different events involving alleged appearances of the risen Jesus, and there are good reasons to doubt the historical reliability of these additional stories in the Gospel of Luke.
REASON #4: In Chapters 3 through 21, the Gospel of Luke adds twenty-four events that are not found in the Gospel of Mark, and there are good reasons to doubt the historical reliability of those accounts of additional events.
REASON #5: The various additions and changes that the author of the Gospel of Luke makes to the Passion Narrative (about the arrest, trials, crucifixion, and burial of Jesus) in the Gospel of Mark are consistently dubious and are thus historically unreliable.
The above five reasons are sufficient to show it is very probable that changes and additions made by the author of the Gospel of Luke to stories about Jesus from the Gospel of Mark are historically unreliable, and thus in terms of stories about Jesus, the Gospel of Luke has very little historical information about Jesus to offer us beyond what we find in the Gospel of Mark.
REASON #1: GENERAL CONSIDERATIONS INDICATING THE HISTORICAL UNRELIABILITY OF THE GOSPEL OF LUKE
The Gospel of Luke is an ancient work of history/biography. Such works are usually unreliable for these reasons[3]:
- Author Bias and Agenda: Ancient historians, like modern ones, brought their own perspectives and goals to their writing. Some works served as political propaganda to glorify rulers (e.g., Velleius Paterculus in the Roman Empire) or defend a particular group.
- Time gap: Many accounts were written long after the events occurred, meaning they were based on memory or secondary sources rather than direct experience.
- Distance in Time and Geography: Accounts written long after or far from the events they describe are often less accurate than eyewitness records.
- Lack of Modern Historical Standards: Ancient writers did not use modern historical methodologies, such as fact-checking or seeking external verification, as standard practice. Their goal was often to write compelling literature, not just present a neutral record of facts.
- Copying and translation: Ancient texts were copied by hand, and errors, omissions, or deliberate changes could be introduced over time.
- Incorporation of Mythology or Folklore: Some ancient historical works blend factual events with mythological or metaphysical explanations, which historians cannot verify with their tools.
There are at least eight general considerations about the Gospel of Luke that give us good reason to expect its additions and changes to stories from the Gospel of Mark to be historically unreliable:
1. The Gospel of Luke is Christian propaganda: it was written by a Christian believer to promote Christian beliefs about Jesus and God.
2. The Gospel of Luke was not written by an eyewitness to the life, ministry, arrest, trials, crucifixion, or the burial of Jesus.
3. The Gospel of Luke was written about five or six decades after the crucifixion of Jesus.
4. There are significant cultural gaps between the author of the Gospel of Luke on the one hand, and Jesus and his disciples on the other hand.
5. There are no details given in the Gospel of Luke about the specific sources that were used by the author as the basis for any of its stories about Jesus.
6. Most of the specific historical events in the Gospel of Luke were based on the Gospel of Mark.
7. The written sources used by the author of the Gospel of Luke were probably copies of copies, and our earliest manuscript of the Gospel of Luke is from at least a century after it was composed, so it is likely a copy of a copy of a copy of a copy.
8. Ancient historical and biographical works, like the Gospel of Luke, often include historically dubious mythology and legends.
Based on these general considerations, we may reasonably conclude that it is probable that the Gospel of Luke is historically unreliable when it makes changes or additions to stories about Jesus from the Gospel of Mark.
The Gospel of Luke is Christian propaganda: it was written by a Christian believer to promote Christian beliefs about Jesus and God:
The unusual nature of the gospels…arises in part from the fact of their being written by people who were not neutral about the person they were describing and whose life they were purportedly reporting. The gospel writers were all “supporters” of Jesus; they were all Christians. Indeed, we have very little literature anywhere near contemporary with Jesus from someone who was either neutral or hostile towards Jesus. (“Jesus and the Gospels” by Christopher Tuckett in The New Interpreter’s Bible, Volume VIII, p.72-73.)
Recognition of the essentially religious character of these works [the Gospels] raises questions for how they are best approached within an academic setting. On the one hand, such a setting demands that these books be studied like any other, with rigorous objectivity that does not exempt them from critical scrutiny. On the other hand, to ignore the religious dimension would represent a failure to engage them on their own terms. … An objective dispassionate reception is the last thing the Gospel writers would have wanted their books to receive. We are free to accept or reject, belittle or embrace, but whatever our response, we ought to understand what these books intend to do: they intend to convert us. (Fortress Introduction to The Gospels by Mark Allan Powell, p.9.)
The authors of our canonical gospels were Evangelists. That means they were primarily focused on proclaiming Jesus. For them, he was the Son of God, the Good Shepherd, and, especially, the long-awaited Messiah. … They knew it was necessary to focus solely on Jesus and to proclaim Jesus’ relation to God and his place within God’s final plan of salvation. (The Historical Jesus: An Essential Guide by James Charlesworth, p.xv.)
The Gospels are not primarily works of history in the modern sense of the word. They aim first of all at proclaiming and strengthening faith in Jesus as Son of God, Lord, and Messiah. Their presentation from start to finish is formed by their faith that the crucified Jesus was raised from the dead and will come in glory to judge the world. (John P. Meier, A Marginal Jew, Vol. I, p.41.)
Because the Gospels in general, and the Gospel of Luke in particular, are instances of Christian propaganda, it is reasonable to anticipate that the authors of the Gospels are more interested in promoting Christian beliefs about Jesus and God than in providing accurate and reliable historical information about the life, ministry, and death of Jesus.
2. THE GOSPEL OF LUKE WAS NOT WRITTEN BY AN EYEWITNESS
The Gospel of Luke was not written by an eyewitness to the life, ministry, crucifixion, or burial of Jesus:
[The author of the Gospel of Luke was] An educated Greek-speaker and skilled writer who knew the Jewish scriptures in Greek and who was not an eyewitness of Jesus' ministry. (An Introduction to the New Testament by Raymond Brown, p.226.)
Luke does not number himself among the eyewitnesses, however, but among those who came later and learned the tradition "handed on to us by those who from the beginning were eyewitnesses and servants of the word" (1:2-3). (“The Gospel of Luke” by R. Alan Culpepper in The New Interpreter’s Bible, Volume IX, p.7.)
...we may discern from the Gospel's preface (1:1-4) that the evangelist [the author of the Gospel of Luke] was not an eyewitness to the life and ministry of Jesus but relied on accounts of others. (Fortress Introduction to The Gospels by Mark Allan Powell, p.97.)
For more than two hundred years most New Testament experts have concluded that the Evangelists [the authors of the Gospels] did not know the historical Jesus; moreover, they wrote decades after his death.
The Evangelists [the authors of the Gospels] were not eyewitnesses of Jesus’ life and thought. … (The Historical Jesus: An Essential Guide by James Charlesworth, p.xiii-xiv.)
…the gospels as we have them were not written by eyewitnesses on the basis of first-hand knowledge of Jesus. (The Historical Figure of Jesus by E.P. Sanders, p.63.)
Because the author of the Gospel of Luke was not an eyewitness to the alleged events described in that Gospel, all of the information in the Gospel of Luke is hearsay. The Gospel of Luke is at best a secondhand account of the life, ministry, and death of Jesus.
3. THE GOSPEL OF LUKE WAS WRITTEN ABOUT FIVE OR SIX DECADES AFTER THE CRUCIFIXION
The Gospel of Luke was written about five or six decades after the crucifixion of Jesus (80-90 C.E.):
DATE [when the Gospel of Luke was composed]: 85 give or take five to ten years. (An Introduction to the New Testament by Raymond Brown, p.226.)
Both Matthew and Luke, working independently of each other, composed larger Gospels in the 70-100 period (most likely between 80 and 90) by combining and editing Mark, a collection of Jesus' sayings that scholars arbitrarily label Q, and special traditions peculiar to Matthew and Luke. (A Marginal Jew, Vol. I by John P. Meier, p.43-44.)
As already noted, both Gospels [Matthew and Luke] are usually dated in the period of 80-95... (Christianity in the Making, Volume I by James D.G. Dunn, footnote #98 on page 160.)
Since the Gospel according to Mark is usually dated about the year 70, a date for Luke in the mid-eighties appears likely. ... A date for the composition of the Gospel [of Luke] in the mid-eighties is based, therefore, on Luke's use of Mark, the absence of references to Paul's letters in Acts, and the Lukan form of Jesus' predictions of the destruction of Jerusalem. (“The Gospel of Luke” by R. Alan Culpepper, in The New Interpreter’s Bible, Volume IX, p.8-9.)
Most scholars guess that both Luke and Acts were composed in the decade between 80 and 90, around the same time as Matthew's Gospel but, apparently, in a different sector. (Fortress Introduction to The Gospels by Mark Allan Powell, p.97.)
The composition of Luke-Acts is usually dated around 80-90, though some experts now suggest perhaps between 90 and 110. (The Historical Jesus: An Essential Guide by James Charlesworth, p.42.)
In any case, it is widely held that the Lucan gospel was composed ca. 80-85 CE, even though one cannot maintain this dating with certainty. ("Luke, The Gospel According To" by Joseph A. Fitzmyer in The Oxford Companion to the Bible, p.472.)
Luke probably wrote his gospel around 80-85 CE, not far from the time Matthew produced his work. ("Luke" by Eric Franklin in The Oxford Bible Commentary, p.925.)
Mark is probably one Lukan source, so that the date [of the composition of the Gospel of Luke] is post-70, indicated also by 19:43 and 21:20. ...The irenic view of the Roman government and the author's failure to cite Paul's epistles, which had been collected by the early second century, indicate a first-century date, probably in the 80s. ("Luke" by David L. Balch in The Eerdmans Commentary on the Bible, p.1104.)
Because the Gospel of Luke was written about five or six decades after the crucifixion of Jesus, nearly all of the eyewitnesses to the arrest, trials, crucifixion, burial, and alleged appearances of the risen Jesus would have been dead or senile by the time this Gospel was composed.[4] Thus, there probably were no competent eyewitnesses available to review or correct the stories in this Gospel when it was being written and when the first copies of it began to circulate.
4. THERE ARE SIGNIFICANT CULTURAL GAPS BETWEEN LUKE AND JESUS
The Gospel of Luke was written in Greek, but Jesus and his disciples probably spoke primarily Aramaic, and it is very probable that Jesus public teachings were delivered in Aramaic.[5] So, there is a significant language gap between the author of the Gospel of Luke and Jesus. This is on top of the previously mentioned significant time gap between the author of the Gospel of Luke and Jesus.
Furthermore, Jesus and his disciples were probably not educated enough to write in any language[6], but the author of the Gospel of Luke was not only a skilled writer in Greek, but he was also familiar with Greco-Roman literature and philosophy.[7] Also, Luke is probably the only gentile author of a book (actually 2 books) in the New Testament.[8] Finally, because Luke's knowledge of Palestine is imprecise, he probably lived and wrote somewhere outside of Palestine.[9]
There are thus a number of significant cultural gaps between the author of the Gospel of Luke and Jesus. These various cultural gaps between Luke and Jesus make it less likely that the Gospel of Luke accurately captured the life and teachings of Jesus.
5. THE GOSPEL OF LUKE DOES NOT PROVIDE DETAILS ABOUT THE SPECIFIC SOURCES IT USED
Modern historical and biographical books usually provide evidence in support of their claims and stories. This is often done with footnotes or endnotes that specify particular documents, books, or interviews that were used as sources of information about the person or event under discussion.
The Gospel of Luke, on the other hand, has no footnotes and no endnotes, and it does not provide names or details about the specific sources used by the author as the basis of the stories it contains about the life, ministry, arrest, trials, crucifixion, and burial of Jesus. This is an indication of a lack of concern and effort by the author of the Gospel of Luke about objectivity, historical accuracy, and historical reliability.
The author of the Gospel of Luke does not tell us that most of his stories about events in the life of Jesus were borrowed from the Gospel of Mark. But it is clear, for example, that the Passion story (about Jesus' arrest, trials, crucifixion, and burial) in the Gospel of Luke is almost entirely taken from the Passion story in the Gospel of Mark.
However, there is no birth story about Jesus in the Gospel of Mark, nor are there any stories about appearances of the risen Jesus in the Gospel of Mark. So, where did the author of the Gospel of Luke get this information or these stories? The author of the Gospel of Luke does not tell us who gave him information or stories about the birth of Jesus or what books or documents he consulted on this matter. The author of the Gospel of Luke does not tell us who gave him information or stories about the alleged appearances of the risen Jesus or what books or documents the author consulted on this matter.
Did some of the stories about Jesus' birth come directly from an alleged eyewitness to an alleged event? If so, who was this person, and why should we believe that person's story? If the storyteller was not an alleged eyewitness, did the storyteller claim to have learned the information from an alleged eyewitness? The author of the Gospel of Luke fails to provide answers to these important questions.
It is, for example, highly unlikely that the author of the Gospel of Luke spoke with an eyewitness to the birth or infancy of Jesus. This Gospel was probably composed in the 80s CE, and Jesus was allegedly born during the reign of King Herod the Great, which means Jesus was born no later than 4 BCE.[10] If Jesus' mother Mary was 16 years old when Jesus was born in 4 BCE, then she would have turned 100 years old in 81 CE. Mary would have been between 99 and 108 years old when the Gospel of Luke was being composed. It is very unlikely that Mary would have lived that long, and if she had, she would probably have been senile, and if she was still alive and her mind was still sharp at that age, her memories of events that took place nine decades in the past would be very unreliable.
Did some of the stories about appearances of the risen Jesus come from an eyewitness to these alleged events? If so, who was this person, and why should we believe that person? If the storyteller who told the author of the Gospel of Luke about these events was not an alleged eyewitness, did the storyteller claim to have learned the information from an alleged eyewitness? The author of the Gospel of Luke does not say.
Jesus was probably in his thirties when he was crucified, and his disciples might well have been younger than Jesus, probably in their twenties. If the disciples were 20 to 25 years old in the year 30 CE (about when Jesus was crucified), then they would have been 70 to 75 years old in the year 80 CE and 80 to 85 years old in the year 90 CE. People living in Palestine two thousand years ago usually did not live to be that old.[4] So, it is unlikely that Jesus' disciples were still alive when the author of the Gospel of Luke composed this Gospel.
The author of the Gospel of Luke does not answer any of these important questions about his sources of information, so NT scholars have had to construct theories about what sources the author used in composing the Gospel of Luke.
The author of the Gospel of Mark, however, was not an eyewitness to the life, ministry, and death of Jesus, so most of the stories the author of the Gospel of Luke used were, at best, second-hand stories from a non-eyewitness.
Because the Gospel of Luke was probably composed between five and six decades after the crucifixion of Jesus, it is unlikely that the author of this Gospel learned about the life, ministry, or death of Jesus from an actual and competent eyewitness to the alleged events described in the Gospel of Luke.
6. MOST HISTORICAL EVENTS IN THE GOSPEL OF LUKE ARE FROM THE GOSPEL OF MARK
Most NT scholars believe that the author used three main sources: the Gospel of Mark, Q (an early collection of sayings and teachings of Jesus), and L (various traditions about Jesus that were maintained by the Christian community to which the author of Luke belonged).[11]
About 40% of the content of the Gospel of Luke comes from the Gospel of Mark, 42% according to the article on "Synoptic Gospels" in Wikipedia (https://en.wikipedia.org/wiki/Synoptic_Gospels):
However, a large portion of the Gospel of Luke contains sayings, parables, or teachings of Jesus, and our focus here is on stories about Jesus, or descriptions of alleged events in Jesus' life. If we just focus on the specific events described in the Gospel of Luke, most of those events are based on the Gospel of Mark.
In the Acts of Jesus by Robert Funk and The Jesus Seminar, the contents of the Gospels are analyzed in terms of specific events, and in the back of that book, there is a numbered list of the alleged specific events in the life of Jesus (on pages 558-564). In the Synoptic Gospels (Mark, Matthew, and Luke), the Jesus Seminar identified 142 specific events, and 106 of those events are found in the Gospel of Luke:
Of the 106 specific alleged events in the Gospel of Luke, 64 of those events were based on the Gospel of Mark. So, about 60% of the specific alleged events in the Gospel of Luke are from the Gospel of Mark. If we set aside the Birth, Infancy, & Childhood events in the first two chapters of the Gospel of Luke and only consider the events in Chapters 3 through 24 of the Gospel of Luke, then 64 out of 98 events, or about 65% of the events in those chapters, are from the Gospel of Mark.
Furthermore, if we focus on just the alleged events in the Passion Story of the Gospel of Luke (Chapters 22 and 23), about 95% (18 out of 19) of those events are based on the Gospel of Mark.
The author of the Gospel of Mark, however, was not an eyewitness to the life, ministry, death or burial of Jesus, so most of the stories in the Gospel of Luke about specific alleged events were, at best, stories from a non-eyewitness source.
The Gospel of Mark was written in Greek, but Jesus and his disciples probably spoke Aramaic, especially when teaching or preaching to the general public. Also, the Gospel of Mark was composed about four decades after the crucifixion of Jesus.
The author of the Gospel of Mark was not an eyewitness of the events described in that Gospel, and, like Luke, there was a significant gap in time between Jesus and Mark, and there was a language gap between Jesus and Mark as well.
7. THE SOURCES BEHIND THE GOSPEL OF LUKE WERE COPIES OF COPIES, AND THE EARLIEST MANUSCRIPT OF THE GOSPEL OF LUKE IS A COPY OF A COPY OF A COPY OF A COPY.
THIS POST IS STILL IN WORK
8. THE GOSPEL OF LUKE IS AN ANCIENT HISTORICAL WORK THAT CONTAINS SOME MYTHOLOGY & LEGENDS
THIS POST IS STILL IN WORK
The above seven general considerations cast significant doubt on the historical reliability of the changes and additions that the author of the Gospel of Luke made to stories about Jesus that were borrowed from the Gospel of Mark. Based on these general considerations, we may reasonably conclude that it is probable that the changes and additions in the Gospel of Luke to the stories about Jesus from the Gospel of Mark are historically unreliable.
COMING UP
In the next post of this series, I will discuss a second reason for believing that the additions and changes made to stories about Jesus from the Gospel of Mark by the author of the Gospel of Luke are historically unreliable:
REASON #2: The Gospel of Mark has no story about the birth of Jesus, but the Gospel of Luke adds a birth story about Jesus to the stories about Jesus found in the Gospel of Mark, and there are good reasons to doubt the historical reliability of the birth story in the Gospel of Luke.
END NOTES
1. Marcus Borg, "The Study of Jesus and Christian Origins" in Jesus at 2000 (Boulder, CO: Westview Press, 1997), see pages 132-134. See also: John P. Meier, Chapter 1, in A Marginal Jew, Vol. I (referenced in End Note #3 below), especially pages 41-45, and the helpful essay "Jesus and the Gospels" by Christopher Tuckett in The New Interpreter’s Bible, Volume VIII (Nashville, TN: Abingdon Press, 1995), pages 71-86.
2. I will cover this point later in this post, in my discussion of general considerations that indicate the unreliability of the Gospel of Luke, specifically the general consideration #6.
3. These issues are from a Google AI Overview, returned from the input phrase: "unreliability of ancient historical works” - viewed 11-23-25.
4. Life expectancy in 1st-century Palestine...(need to find my notes on this).
5. John P. Meier, A Marginal Jew, Vol. I (New York, NY: Doubleday, 1991), pp.266-267.
6. Jesus and his disciples were probably not educated enough to write in any language (need references to Jesus scholars)
7. Mark Allan Powell, Fortress Introduction to the Gospels (Minneapolis, MN: Fortress Press, 1998), p.97.
8. The Gospel of Luke is probably the only book in the New Testament that was written by a gentile (need references to NT scholars)
9. Mark Allan Powell, Fortress Introduction to the Gospels (Minneapolis, MN: Fortress Press, 1998), p.98.
10. John P. Meier, A Marginal Jew, Vol. I (New York, NY: Doubleday, 1991), pp.375-377.
11. Fortress Introduction to the Gospels, "Jesus and the Gospels", and The New Interpreters Bible, Vol. IX. (need page numbers).

