Luke was a practitioner of the Gospel. Not only did Luke intensely study, memorize, and meditate on the Scriptures, but he also ministered to people. Luke served alongside Paul for years. He was not content to study and know the gospel, he got to work because of it. He got to work teaching it and applying it. He got to work writing to his friends about it.
There is a danger for modern day gospel narrators to be satisfied with simply studying the Scriptures and knowing the gospel. Luke’s example teaches that true study of the Scriptures and intimate knowledge of the gospel should compel us to action.