Forasmuch as many have taken in hand to set forth in order a declaration of those things which are most surely believed among us, Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word; It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus, That thou mightest know the certainty of those things, wherein thou hast been instructed. – Luke 1:1-4
Luke was a medical doctor (Colossians 4:14) and a companion of the Apostle Paul most likely meeting him in Antioch of Syria. He also wrote the Book of Acts as an eyewitness to most of those events. He is the only Gentile author of a New Testament Book. His Gentile approach and audience begs a detailed, orderly account of the events in the life of Jesus based upon multiple eyewitness accounts.
His audience was initially a single man of God. He writes to him proving that the Christian Faith is based on true and verifiable evidences. Luke often refers to Christ as the “Son of Man” which emphasizes the fact that Jesus was a man in the flesh. His genealogy runs all the way back to Adam, proving the humanity that is in Christ. And, in contrast to Matthew, Luke shows angels ministering unto Jesus as they do other humans.
Luke’s purpose is to assure believers that what they have been taught is true and can be trusted for peace and comfort.