What Is the Synoptic Problem?

Question 1078. The synoptic problem is the scholarly puzzle of why Matthew, Mark, and Luke overlap so closely in wording, order, and even sentence structure in places, and yet differ from each other in the details each writer chooses to include or leave out.

Read the feeding of the five thousand in all three Gospels side by side and you will see exactly what generates the question. The wording is sometimes almost identical, sometimes noticeably different, and working out why has occupied serious scholars for a very long time. None of this threatens the inspiration or reliability of the Gospels. If anything, understanding the synoptic problem well only deepens confidence in how carefully these accounts were assembled.

What the Synoptic Problem Actually Is

Matthew, Mark, and Luke are called the synoptic Gospels because they can be viewed together, from the Greek meaning seen together, in a way that highlights both their close agreement and their real differences. Roughly ninety per cent of Mark’s content appears in Matthew, and a similar proportion appears in Luke, often in remarkably similar Greek wording, while John stands largely apart with its own distinct material and structure.

The question this raises is straightforward. If these are three independent eyewitness accounts, why do they so often share exact phrasing rather than simply agreeing on substance the way independent witnesses to an event normally would? And if they are not fully independent, what is the relationship between them, and does that relationship matter for how we read them as Scripture?

The Main Proposed Solutions

The majority scholarly position today, including among conservative evangelical scholars, holds to Markan priority, the view that Mark was written first and that both Matthew and Luke used Mark as a source alongside other material. A second proposed source, often labelled Q from the German Quelle, meaning source, is a hypothetical collection of Jesus’ sayings (logia) that some scholars believe Matthew and Luke both drew on independently to explain material they share that is absent from Mark.

An older view, the Griesbach or Matthean priority hypothesis, argues instead that Matthew was written first, with Mark composing an abbreviated version and Luke drawing on both. I hold Markan priority as the most probable explanation of the evidence, while treating the Q hypothesis itself with a genuinely open hand, since no manuscript of any such document has ever actually been found. It remains a scholarly inference, not an established fact, and Scripture does not depend on settling it.

What all serious proposals share, whichever direction of dependence they favour, is confidence that real, careful historical work stands behind our Gospels rather than free invention. Even scholars who reject the supernatural elements of the text outright generally still accept that Matthew, Mark, and Luke are working from genuine early sources close to the events, which is itself a significant concession worth noticing when the conversation turns sceptical.

I would encourage any curious reader to try the exercise for themselves rather than taking either a sceptic’s or a pastor’s word for it. Sit down with a single Gospel harmony, or simply three coloured pens and the feeding of the five thousand in Matthew, Mark, and Luke side by side, and mark where the wording matches exactly, where it differs slightly, and where one account includes a detail the others omit. That hands-on exercise teaches the shape of the synoptic problem far more vividly than any summary, mine included, and it tends to leave readers more confident in the Gospels rather than less, once they have seen the actual pattern for themselves. It takes perhaps twenty unhurried minutes, and it is twenty minutes well spent for anyone who wants to move past secondhand opinions on the subject, and it costs nothing beyond a Bible you likely already own and a few coloured pens from a kitchen drawer.

Does This Threaten Inspiration?

Not remotely, and Luke tells us so himself in his own opening words. He explicitly describes drawing on the accounts of many who had gone before him and on his own careful investigation before writing his orderly account, in Luke 1:1-4. Inspiration never required the biblical authors to work in isolation from every other source, spoken or written. The Holy Spirit superintended real human authors using real human methods, including consulting earlier accounts, to produce exactly the text God intended.

This is worth holding firmly against a common misunderstanding. Verbal, plenary inspiration means the Spirit ensured the resulting words were precisely what God intended, not that each author worked without reference to anything else available to him. Moses likely used earlier records in Genesis. The author of Kings cites other annals by name. Shared sources among the synoptic writers fit the same pattern rather than breaking it.

What the Differences Actually Show Us

Where Matthew, Mark, and Luke diverge, the differences are rarely contradictions and almost always reflect distinct purpose and audience. Matthew, writing with a Jewish audience in view, emphasises Jesus as the promised Messianic King and traces his lineage through Abraham and David. Mark, likely writing for a Roman audience, moves at a brisk pace and emphasises Jesus as the suffering Servant who acts more than he speaks. Luke, writing for a broader Gentile readership, highlights Jesus’ compassion for the marginalised and includes material, such as the parables of the lost sheep, coin, and son, found nowhere else.

Far from undermining reliability, these selective emphases are exactly what you would expect from careful, purposeful historians rather than from mechanical copyists. Each writer, under the Spirit’s guidance, shaped his material to serve his audience and his theological purpose, while agreeing entirely on the events, words, and identity of Jesus that actually matter.

Answering the Sceptical Version of the Question

Sceptics sometimes use the synoptic problem to suggest the Gospels are unreliable collaborative fiction rather than genuine history. This gets the evidence backwards. Close verbal agreement across independent-minded authors, alongside honest and unresolved differences in detail, is exactly the fingerprint of authentic historical sources drawing carefully on shared material, not the fingerprint of invented legend, which tends to diverge wildly or converge suspiciously depending on which theory is being pressed.

A clear lay-level walkthrough of the whole debate is available at the Bible.org study library, and it is also worth noting how this connects to wider questions about Scripture’s reliability that I have addressed at length elsewhere, including the Q source theory in more technical detail and the broader question of whether we can know the Bible is true at all.

Why I Do Not Find This Threatening to Confidence in Scripture

Some Christians first encounter the synoptic problem through a sceptical lecturer or a popular apologetics video designed to unsettle rather than inform, and the initial reaction is often alarm, as though noticing literary relationships between the Gospels were somehow a discovery the church had hidden. It was not hidden. Augustine wrote about the relationship between the Gospels in the fourth century, and careful readers have always noticed both the close agreement and the real differences.

What changes once you study the question properly is not whether the Gospels agree with each other in substance, since they plainly do on everything that matters, but your appreciation for how carefully each author handled his material. Four Gospels, agreeing on the central facts of Jesus’ life, death, and resurrection while shaping their presentation for distinct audiences and purposes, is a stronger historical foundation than one flattened, harmonised account would have been, and the synoptic problem, properly understood, only reinforces that conclusion.

Consider, too, how the early church handled these differences. Nobody in the second or third century tried to erase the discrepancies in detail between the Gospels or to harmonise them into a single flattened narrative, though attempts like Tatian’s Diatessaron did exist as a devotional aid rather than a replacement. The four separate accounts were preserved side by side, differences and all, because the church trusted the underlying testimony enough not to need to smooth it into artificial uniformity.

So, now what?

If the synoptic problem comes up in conversation, whether from a curious friend or a determined sceptic, you can engage it without any nervousness. It is a fascinating literary and historical puzzle, not a threat to the Gospels’ trustworthiness, and working through it carefully tends to increase confidence in the eyewitness foundation behind Matthew, Mark, and Luke rather than eroding it.

What matters far more than resolving every detail of literary dependence is what all three writers agree on without exception: Jesus lived, taught, died, and rose again, and that testimony reaches us through sources close enough to the events to matter and careful enough with each other’s material to be trusted.

“Inasmuch as many have undertaken to compile a narrative of the things that have been accomplished among us, just as those who from the beginning were eyewitnesses and ministers of the word have delivered them to us, it seemed good to me also, having followed all things closely for some time past, to write an orderly account for you, most excellent Theophilus.”

Luke 1:1–3 (ESV)