1,2,3rd John.What i got out of this book is if we truly know GOD we walk in love and have genuine love for one another And the father.IF say we walk in the light but do not love are fellow brothers and sisters we are a liar . ALSO,if are truly born again we do no practice sin,if we habitchuly practice sin we are not of the father ,we are not born again .WE cannot walk in light and darkness and practice truth.