"Believing", part of the purpose of the Gospel of John, given in John 20:30,31, is about 'Continuing Faith". If you miss it in the reading of the purpose, or the 7 miracle signs of John as highligted in this book, you will get it with the additional chapters, especially those based on the purpose of I John in I John 5:13, "that you may continue to beilee in the name of the Son of God".