All Christians stand on the testimony, "I have seen the Lord" or "I saw the Lord." We worship and serve a God who has revealed himself to humanity, and most explicitly in the person of Jesus Christ, who is God in the flesh. But we do not only believe others have seen him, nor do we just see him or try to see him, we are sent by him into the world. We, like Isaiah, respond to the Lord by saying, "Here I am. Send me," because God is alive and he welcomes us as his partners in his mission to all the earth.