Wondrously and deliciously complicated.
The “Triple Tradition” is material in Mark, Luke, and Matthew. And please remember, Mark is shorter than these other two gospels.
I like that diagram you posted. I like it so much that I don't know what some areas mean, but I want to know!
Just checking my understanding. Each pie represents one of the synoptics. I got that much.
But what do the red and gray lines represent? Thankfully, found out that ChatGpt can analyze and explain images!
Here's from ChatGPT:
This image is a **visual breakdown of the relationships between the Synoptic Gospels**—**Mark, Matthew, and Luke**—using pie charts and color-coded segments to illustrate how much content is shared or unique among them. It reflects scholarly analysis often associated with the **Synoptic Problem**, which explores how these gospels are literarily related.

Key Terms:
* **Synoptic Gospels**: The Gospels of Matthew, Mark, and Luke. They are called "synoptic" because they share a similar structure and content, often seen "with the same eye."
* **Triple Tradition**: Material shared by **all three** Gospels.
* **Double Tradition**: Material found in **Matthew and Luke** but **not in Mark**.
* **Unique Material**: Content that appears in **only one Gospel**.

Mark
* **76%** of Mark's content appears in all three (Triple Tradition).
* **18%** is shared with Matthew but not Luke.
* **3%** is unique to Mark.
* **3%** is shared only with Luke.
This supports the theory that **Mark was used as a source** by both Matthew and Luke (known as **Markan Priority**).

Luke
* **41%** of Luke aligns with all three (Triple Tradition).
* **23%** is shared only with Matthew (Double Tradition).
* **35%** is unique to Luke.
* **1%** shared only with Mark.

Matthew
* **45%** matches all three (Triple Tradition).
* **25%** shared only with Luke (Double Tradition).
* **20%** is unique to Matthew.
* **10%** shared only with Mark.

What the Image Means:
This chart shows that:
1. **Mark’s Gospel heavily overlaps** with both Matthew and Luke, reinforcing the view that it may have been written first.
2. The **Double Tradition** (shared by Matthew and Luke but not Mark) hints at another common source, often theorized as **“Q”** (from *Quelle*, German for “source”).
3. Each gospel contains **unique material**, reflecting each evangelist’s unique theological and community context.
---

Scholarly Implications:
This kind of data supports the **Two-Source Hypothesis**:
* Matthew and Luke used **Mark** as a primary source.
* They also drew from another lost source (**Q**) to explain the double tradition.
* Each author also had **unique material** not shared with others.
Let me know if you'd like a simplified version of this or help understanding the “Q source” or other gospel theories!