From today's first reading from Isaiah 49, we read The LORD said to me, You are my servant, in you, Israel, I show my glory and I will make you a light to the nations, that my salvation may reach to the ends of the earth. Here it's made clear the mission of a Christian. We are to show God's glory by being a light to the world, spreading the good news of his salvation. Nothing less and nothing more. In other words, a Christian must be a soul saver. It's easy to remember and completely doable through the personal power of our Lord Jesus Christ and the Holy Spirit, if we simply obey God.