A person's life should affect the world. In fact believers do not have the light, but realize that it can radiate the light of God through its life. As the moon does not have its own light; who has light is the sun. But the moon reflects the sun's light so that it shines in the darkness of night. Consistency means this action is done on an ongoing basis. This is the same principle as the function of the lights that illuminate so that people can work, not just lights that turn off or live. So if one good deed is done then it is like a flashing light. The lights that go on mean our whole lives should be laid out as good as possible so that it functions as light. The more we live in the truth, the more radiant and sustainable we become. Be light in life.