The Law of Life means that I do not try to be or do anything in my own strength. Instead, the Life leads me, the Life instructs me, and the Life gives me the words and the actions.
I am not a Christian because I believe in the Bible, follow the teachings of Jesus, and live a good life. I am a Christian because Christ is my Life. Since Christ is my Life, I no longer live, but it is Christ Who lives in me. I do nothing to achieve this, it just is. Because He lives, I live.