2Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word;
3It 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,
4That thou mightest know the certainty of those things, wherein thou hast been instructed.”
In addition to being a physician and an historian, Luke was a missionary, a companion of Paul in his missionary travels. This is confirmed by the fact that Luke uses the pronoun “we” in Acts 16:10 and 20:5-6. Luke wrote this Gospel in about 58 A.D., after Mark and Matthew had written their accounts of Jesus’ life. As a physician and as a Greek, Luke was interested in the physical condition of Jesus and presents Him as the Perfect Man, virgin born, sinless, the God-man.
Luke had a perfect understanding of all that he wrote because he received his understanding “from the very first,” which is to say that he received this understanding from God who is “the First and the Last,” and the One who is above all. He was inspired from on high, from heaven, from above. As a good historian Luke did do research, but his words, his information, and his understanding came from God above.
Luke was writing to Theophillus (One Who Loved God) that he might be absolutely certain of the true facts about Christ. When we receive words directly from God, as we do only in the Bible, then there is absolute certainty about what was said and done, and about what we should believe.