Seminary throwback: Why Four Gospels in our Bibles?
In regard to the synoptics, the understanding of the Greek being “to see things together” is a helpful starting point. My pastor and an older gentleman in our church have explained why there are four Gospels too me with this analogy: when an accident happens and the reports are taken from each person who saw it, each one is going to have a slightly different perspective because of where they were. Each Gospel shares a different focus and was written a by a different author. Each one had a goal to show Jesus as the Messiah and Savior, but to different groups of people that God had respectively called them too. Matthew wrote to the Jews about Jesus fulfilling Messianic prophecy (KKQ, 178); Mark to the Romans showcasing that Jesus truly was the Son of God (KKQ, 228); Luke to the Gentiles revealing that Jesus was the Suffering-Servant of Messianic prophecy (KKQ, 256, 287); and John to all people that they should believe on Jesus Christ and find eternal life in Him (KKQ, 290).
The Cradle, the Cross, and the Crown: An Introduction to the New Testament
by Andreas Köstenberger, L. Scott Kellum, and Charles L. Quarles (WORDsearch Bible Software, 2014)