As Paul stands trial before Governor Festus and King Agrippa, he recounts his conversion story one last time in the book of Acts, including details that he hadn't mentioned before – namely, the specific call of Jesus on his life: to be a servant who turns on the lights in people's stories, and leads them to repentance and faith.
We often think about Jesus as a king, singing Christmas songs about the manger being his throne, etc. All of that is well and good and deserved. But Isaiah continues to refer to him as a servant of the Lord; the one who will obey Yahweh and carry out his mission in the world.