the structure of the gospels

Matthew, Mark, Luke & John are all structured differently.  Matthew leans heavily on the notion that Jesus has fulfilled the prophecies of the Old Testament. He even begins with a tight genealogy that goes all the way back to Abraham. This is why many scholars conclude that Matthew's audience was Jewish, because the fulfillment of prophecies would be important to them.  Mark on the other hand doesn't even mention the birth of Jesus, but begins with the baptism of Jesus by John.  His gospel focuses on the power of Jesus and the miracles he performed.  Luke is not an eyewitness.  He is a second generation believer so his gospel becomes very valuable to later generations as he states his purpose is to "carefully investigate everything from the beginning" (Luke 1:1-4).  John was an eyewitness and focuses on the spiritual formation side of the equation as he records those who "believed on him" (John 3:15-17 for example).  He concludes with the promise of "life in His name" to every one that believes (John. 20:30-31).  The structure of the Gospels conveys the comprehensive mission of our Christ!  Praise God!