Behold, how great a love the Father has bestowed on us, that we should be called children of God! For this cause the world doesn't know us, because it didn't know him.
Now how do I know that I've passed from death to life? Because I love the family of God, I love the brethren. Jesus said to His disciples, "By this sign shall the world know that you are my disciples, that you love one another" ( John 13:35 ). That's the greatest witness to the world is the love within the Christian body. They know that you are really Christians because you love one another as you do. Hey, not only is it the proof to the world, but it's also the proof to yourself. How do you know that you have passed from death unto life? Because God has given you such a love for the body of Christ, those within the body of Christ.