Luke 1:1-4
Many have undertaken to draw up an account of the things that have been fulfilled among us, just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me to write an orderly account for you, most excellent Theophilus, so that you may know the certainty of the things you have been taught.

Luke’s preface deals with two matters: motivation and purpose. Here is a paraphrase which shows this organization.

Motivation
So important are the events concerning Jesus many people have already taken in hand to blend into a narrative the reports concerning these happenings (v. 1).
Eyewitnesses have handed down these reports to us (v. 2).
I [Luke] have thoroughly investigated all essential matters (v. 3).

Purpose Thus equipped, I [Luke] write this Gospel in order that you, Theophilus and others like you, may know the exact truth with respect to the matters concerning which you have already received some instruction (v. 4).

Luke’s purpose was to explain the entire gospel story to Theophilus, from the story of the birth of John the Baptist until the ascension of Christ. In Acts, Luke continued the story of the spread of the gospel until Paul brought it to Rome.

We can thank Theophilus for his concerns. Without his questions, we would not have this Gospel, with its story of Jesus’ birth and childhood and its record of many of Jesus’ parables. Most of 9:51-18:35 is not recorded in any of the other gospels.

How would a biographer prepare for writing about someone’s life?

What period in history would you like to visit? Why?

How would you prepare to serve as a character witness in court for your best friend?