Dr. Williams breaks down the message of 1 John into four "Tests of Life". He states that if you can honestly say that you pass each of these four tests, you can be assured that you have a relationship with God and have confidence in your salvation.
Here are the four tests......
1. Do you believe in Jesus? Do you believe that He is the eternal Son of God who came in flesh?
2. Do you repent of sin?
3. Do you love the brethren?
4. Do you persevere in the faith until the end?
The message of 1 John is beautiful as it tells us the importance of having a relationship with God and tells us how we can approach building and growing this relationship (and does address each of the above questions). If you've never taken the time to read this book I encourage you to take some time now and do so. I promise you will be blessed and, if you follow John's message in your own life, you will be changed.