"I too have decided, after investigating everything accurately anew, to write it down in an orderly sequence for you, most excellent Theophilus" - Luke 1:3
Luke was one of the four authors of the Canonical Gospels. We don't know much about his early life, but we do know he spent a number of years with St. Paul of Tarsus evangelizing across the Roman empire. He is known as a physician, and of one of few close friends with St. Paul. While both did not know Jesus during his ministry on earth, Paul later on had an encounter with the resurrected Jesus, turning him away from his previous job of capturing, torturing and killing early Christians.
I've always enjoyed reading Luke's account. Perhaps it's because it's written more in a biographical sense than an evangelical sense. From Luke's description to Theophilus, he's taken great care in getting the facts correctly - investigating it on his own without influence from other writings. Its from this single verse that I can calm any doubts that surface in my mind about the accounts of Jesus. Not only did Luke spend years interviewing others to get a deeper understanding of who Jesus was - but he did it in a vacuum, knowing that his work was going to be as accurate as possible. And he did it in an environment that was, in many cases, openly (and physically) hostile to Christians.
I also enjoy Luke's writings in Acts, learning how the first Apostles took over Jesus' ministry after his death. It provides an interesting contrast to what he documented about Jesus, and shows just how perfect Jesus was.
While it will be a long time before I see Jesus in his glory, I consider myself extremely fortunate to have writings that clear doubt from my mind - and remind me of the hope that springs forth from my faith in Christ.