Mark 10:43-45. When we look at the story of Jesus coming into this world, miraculously born to his mother, Mary, and we understand why Jesus came to earth and believe in him, we can’t help but serve him. Christian's lives are to be marked by service. It's a part of our identity. The Christmas story isn’t about a cute baby, but a mighty Savior. Jesus was born in a manger, but he came for a cross. He came to serve God by giving his life as a ransom for many. So we live in service to him out of thankfulness to him.